Question

6.) A car covers 200 km in 4 h and then another 240 km in 34 h. Find its average speed.
7. A truck travels at 40 km/h for 3 h and at 35 km/h for 2 h. Find its average speed.
8. A man walks 6 km at 12 km/h and returns at 10 km/h. Find his average speed.
9. A train covers the first 160 km of a journey at 40 km/h, the next 180 km at 45 km/h, and
the last 200 km at 50 km/h. Find (i) the total time it takes to complete the journey and
(ii) the average speed of the train during the whole journey.
10. (1) A train covers a distance of 670 km in 6 h 5 min. If it covers the first 390 km of the
journey at 90 km/h, find its speed for the rest of the journey.
(ii) A bus covers 630 km in 9 h. If it completes the first two thirds of the journey a
60 km/h, calculate its speed for the rest of the journey.
11. A train travelling at 60 km/h completes a journey in 8 h. How much faster would it have
travel to cover the same distance in 6 h?
12. A bus travelling at 42 km/h covers a distance in 5 h. How much time would it save it
increased its speed by 8 km/h?
13. A girl walks 12 km at the speed of 3 km/h. What change should she make in her speed
take (i) an hour less and (ii) an hour more to cover the distance?
14. A motorcyclist travels at 30 km/h and stops for half an hour at the end of every 75 km. E
long will it take him to cover 375 km?
someone​

Answer 1

Step-by-step explanation:

See, a car covers 200 km in 5 hours. We know that speed = distance÷time. Therefore, 200÷5 gives you 40kmph. Actually average speed is total distance divided by total time but here we dont have different distances or time. Therefore, the total distance is 200 km n total time is 5 hours

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