Question

4) The maximum speed of a train is 90 km/h. It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed?


5) Two cars A and B race each other. The Car A ran for 2 minute at a speed of 7.5 km/h, slept for 56 minute and again ran for 2 minute at a speed of 7.5 km/h. find the average speed of the car A in the race.

6) Anand leaves his house at 8.30 A.M for his school. The school is 2 km away and classes start at 9.00 A.M. If he walks at a speed of 3 km/h for the first kilometre, at what speed should he walk the second kilometre to reach just in time?


7) An object travels 20 m in 2 s and then another 16 m in 2 s. What is the average speed of the object?

8) An aeroplane travels with the velocity of 1000m/s towards west and has to cover the distance of 500km. How long will it take to cover the distance?


9) A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in km/h.


10) A motorcyclist drives from place A to B with a uniform speed of 30 km h-1 and returns from place B to A with a uniform speed of 20 km h-1. Find his average speed.


11) The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. How fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey ?​

Answer 1

4)the average speed of the train will be the ratio of total distance covered to the total distance travelled.

so it will be: average speed: 400/10 = 40 kmph

maximum speed: 90

thus the ratio is: 90/40 = 9:4

5)the answer is shown in image.

6)I didn't know

7)2.85 m/s.

8)didn't know