Question

16. A car driver travels from the plains to the hill station which are 200 km apart at
an average speed of 40 km per hour. In the return trip, he covers the same
distance at an average speed of 20 km/hr. Find the average speed of the car
over the entire distance of 400 km.​

Answer 1

Answer:

According to question,

Average speed = 2xy / x+y

where x and y are two different speed covering same distance

Average speed = 2×40×20(20+40)

= 26.67 km / h

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Answer 2

Time = distance/speed

200/40=5 hour

so. =26.66 answer