Selina solutions concise mathematics class 6 icse Solutions for Chapter 17 idea of speed distance and time

Exercises in Chapter 17 idea of speed distance and time Grade 6

Exercise 17(A)

Exercise 17(B)

Questions in Exercise 17(A)

Q1) A train covers 51 km in 3 hours. Calculate its speed. How far does the train go in 30 minutes?

Q2) 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.

Q3) A train travels 700 meters in 35 seconds. What is the speed in km/h?

Q4) 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?

Q5) 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

Q6) A boy drives his scooter with a uniform speed of 45 km/h. Find: (i) the distance covered by him in 1 hour 20 minutes. (ii) the time taken by him to cover 108 km. (iii) the time taken to cover 900 m.

Q7) I travel a distance of 10 km and come back in $2\frac{1}{2}$ hours. What is my speed?

Q8) A man walks a distance of 5km in 2 hours. Then he goes in a bus to a nearby town, which is 40km, in further 2 hours. From there, he goes to his office in an autorickshaw. a distance of 5km, in $\frac{1}{2}$ hour. what was his average speed during the whole journey?

Q9) Jagan went to another town such thst he covered 240km by a car going at 60 $kmh^{-1}$ . Then he covered 80km by a train, going at $100kmh^{-1}$ and the rest 200km, he covered by a bus, going at $50kmh^{-1}$ . What was his average speed during the whole journey?

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

Questions in Exercise 17(B)

Q1) A train 180m long is running at a speed of 90km/h. How long will it take to pass a railway signal?

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

Q3) A train 120m long passes a railway platform 160m long in 14 sec. How long will it take to pass another platform which is 100m long?

Q4) Mr. Amit can walk 8km 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) 2500m ?

(ii) 6.5km ?

Q5) Which is greater: a speed of 45km/h or a speed of 12.25 m/sec?

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

Q6) A and B start from the same point and at the same time speeds 15km/h and 12km/h respectively, find the distance between A and B after 6 hours if both move in:

(i) same direction

(ii) the opposite directions.

Q7) A and B start from the same place, in the same direction and at the same time with speeds 6km/h and 2m/sec respectively. After 5 hours who will be ahead and by how much?

Q8) Mohit covers a certain distance in 6 hrs by his scooter at a speed of $40kmh^{-1}$

(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.

Q9) A boy swims 200m 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) $kmh^{-1}$

Q10)

A distance of 14.4km is covered in2 hours 40 minutes. Find the speed in $ms^{-1}$ . With this speed Sakshi goes to her school, 240m away from her house and then returns back. How much time, in all will Sakshi take?