a car travels from city a to b on a straight road with velocity 36km/h and then returns from city b to a with a constant speed of 72km/h the average speed of car is?
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Answer:
48 km/h
Explanation:
Average speed = total distance / total time taken
Let distance be x and time for each journey be t1 and t2.
Total Distance = 2x
Total time = t1 + t2
t1 = x/36
t2 =x/72
Average speed = 2x/ (x/36 + x/72)
= 72 × 2/3 = 48km/h
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