## Selina Concise Mathematics Class 6 ICSE Solutions Chapter 17 Idea of Speed, Distance and Time

**Selina Publishers Concise Mathematics Class 6 ICSE Solutions Chapter 17 Idea of Speed, Distance and Time**

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### Idea of Speed, Distance and Time Exercise 17A – Selina Concise Mathematics Class 6 ICSE Solutions

**Question 1.**

A train covers 51 km in 3 hours. Calculate its speed. How far does the train go in 30 minutes?

**Solution:**

Given : Distance = 51 km

Time = 3 hours

**Question 2.**

A motorist travelled the distance between two towns, which is 65 km, in 2 hours and 10 minutes. Find his speed in metre per minute.

**Solution:**

Distance between two towns = 65 km

Time taken = 2 hr 10 min

**Question 3.**

A train travels 700 metres in 35 seconds. What is its speed in km/h?

**Solution:**

Distance = 700 m

Time taken = 35 sec

**Question 4.**

A racing car covered 600 km in 3 hours 20 minutes. Find its speed in metre per second. How much distance will the car cover in 50 sec?

**Solution:**

Distance covered = 600 km

Time taken = 3 hr 20 min

= Speed x Time

= 50 x 50 m = 2500 m or 2.50 km

**Question 5.**

Rohit goes 350 km in 5 hours. Find :

(i) his speed

(ii) the distance covered by Rohit in 6.2 hours

(iii) the time taken by him to cover 210 km.

**Solution:**

Distance covered = 350 km

Time taken = 5 hours

**Question 6.**

A boy drives his scooter with a uniform speed of 45 km/h. Find :

(i) the distance covered by him in 1 hour 20 min.

(ii) the time taken by him to cover 108 km.

(iii) the time taken to cover 900 m.

**Solution:**

Speed of the scooter = 45 km/h

**Question 7.**

I travel a distance of 10 km and come back in 2 hours. What is my speed?

**Solution:**

Total distance covered = 10 km + 10 km = 20 km

**Question 8.**

A man walks a distance of 5 km in 2 hours. Then he goes in a bus to a nearby town, which is 40 km, in further 2 hours. From there, he goes to his office in an autorickshaw, a distance of 5 km, in hour. What was his average speed during the whole journey?

**Solution:**

Distance of 5 km travelled on foot in 2 hours

Distance of 40 km travelled by bus in 2 hours

Distance of 5 km travelled by Rickshaw in hour

Total distance covered = 5 + 40 + 5 = 50 km

**Question 9.**

Jagan went to another town such that he covered 240 km by a car going at 60 kmh^{-1}. Then he covered 80 km by a train, going at 100 kmh^{-1} and the rest 200 km, he covered by a bus, going at 50 kmh^{-1}. What was his average speed during the whole journey?

**Solution:**

Distance covered 240 km by car with speed 60 km/h

Distance covered 80 km by train with speed 100 km/h

and rest distance covered 200 km by bus with speed 50 km/h

Total distance covered = (240 + 80 + 200) km = 520 km

**Question 10.**

The speed of sound in air is about 330 ms^{-1}. Express this speed in kmh^{-1}. How long will the sound take to travel 99 km?

**Solution:**

Speed of sound in air = 330 m/sec

### Idea of Speed, Distance and Time Exercise 17B – Selina Concise Mathematics Class 6 ICSE Solutions

**Question 1.**

A train 180 m long is running at a speed of 90 km/h. How long will it take to pass a railway signal?

**Solution:**

Distance = 180 m

Speed = 90 km/h

**Question 2.**

A train whose length is 150 m, passes a telegraph pole in 10 sec. Find the speed of the train in km/h.

**Solution:**

Distance = 150 m

Time taken = 10 sec

**Question 3.**

A train 120 m long passes a railway platform 160 m long in 14 sec. How long will it take to pass another platform which is 100 m long?

**Solution:**

Distance covered = 120 m + 160 m = 280 m

Time taken = 14 seconds

**Question 4.**

Mr. Amit can walk 8 km in 1 hour 20 minutes.

(a) How far does he go in :

(i) 10 minutes ?

(ii) 30 seconds ?

(b) How long will it take him to walk :

(i) 2500 m ?

(ii) 6.5 km ?

**Solution:**

Amit walks 8 km in 1 hour 20 min

**Question 5.**

Which is greater : a speed of 45 km/h or a speed of 12.25 m/sec?

How much is the distance travelled by each in 2 seconds?

**Solution:**

First speed = 45 km/h

Second = 12.25 m/sec

**Question 6.**

A and B start from the same point and at the same time with speeds 15 km/h and 12 km/h respectively, find the distance between A and B after 6 hours if both move in :

(i) same direction

(ii) the opposite directions.

**Solution:**

A’s speed = 15 km/h

B’s speed = 12 km/h

Distance covered by A in 6 hours = 15 x 6 = 90 km

and Distance covered by B in 6 hours = 12 x 6 = 72 km

(i) Distance between A and B when they move in the same direction = 90 – 72 = 18 km

(ii) Distance between A and B, when they move in the opposite directions = 90 + 72 = 162 km

**Question 7.**

A and B start from the same place, in the same direction and at the same time with speeds 6 km/h and 2 m/sec respectively. After 5 hours who will be ahead and by how much?

**Solution:**

A’s speed = 6 km/h

B’s speed = 2 m/sec

Distance covered by A in 5 hours = 6 x 5 = 30 km

and distance covered by B in 5 hours = 5 x 60 x 60 x 2 m = 36000 m

= = 36 km

B will be ahead and 36 – 30 = 6 km ahead.

**Question 8.**

Mohit covers a certain distance in 6 hrs by his scooter at a speed of 40 kmh^{-1}.

(i) Find the time taken by Manjoor to cover the same distance by his car at the speed of 60 kmh^{-1}.

(ii) Find the speed of Joseph, if he takes 8 hrs to complete the same distance.

**Solution:**

Mohit’s speed = 40 km/h or kmh^{-1}

Distance covered in = 6 hours

Distance = 40 x 6 = 240 km

(i) Manjoor car’s speed = 60 kmh^{-1}

He will cover the distance of 240 km in = = 4 hours

(ii) Joseph covered that distance in 8 hours

His speed = = 30 kmh^{-1}

**Question 9.**

A boy swims 200 m in still water and then returns back to the point of start in total 10 minutes. Find the speed of his swim in

(i) ms^{-1}

(ii) kmh^{-1}.

**Solution:**

Distance swimed by a boys of 200 m + 200 m = 400 m

Time taken = 10 minutes

**Question 10.**

A distance of 14.4 km is covered in 2 horus 40 minutes. Find the speed in ms^{-1}. With this speed Sakshi goes to her school, 240 m away from her house and then returns back. How much time, in all, will Sakshi take?

**Solution:**

Distance = 14.4 km

Time taken to cover = 2 hrs 40 min

= hrs

Selina Class 6 Maths ICSE SolutionsPhysicsChemistryBiologyGeographyHistory & Civics

SHIVKUMAR CHETTY says

Very helpful.

Can we have practices question papers with answers.

Rajashekhar says

will be updating soon. You can Read RD Sharma Class 6 Solutions, RS Aggarwal Solutions, ML Aggarwal Class 6 Solutions for practicing. Thank you for your feedback.

Raghvendra says

Very good????????

Raghavendra says

Very good????

Reena Srivastava says

Can we get visual lessons for better understanding??

Raghavendra says

Hi Reena

Raghvendra says

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Raghavendra says

Hi Reena