## 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**

### 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:

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:

Question 3.

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

Solution:

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:

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:

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:

Question 7.

I travel a distance of 10 km and come back in 2\(\frac { 1 }{ 2 }\) hours. What is my speed?

Solution:

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 \(\frac { 1 }{ 2 }\) hour. What was his average speed during the whole journey?

Solution:

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:

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:

### 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:

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:

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:

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:

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:

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:

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:

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:

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:

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: