If a car goes from A to B at a speed of 60 km/hr and returns back from B to A at a speed of 40 km/h. Calculate its average speed.
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Average Speed = 48 km/hr
Explanation:
Assuming X is the distance AB in km, then the total time will be:
Time for AB = distance / speed = X / 60
Time for BA = X / 40
Total time taken = X / 60 + X / 40
Total length = X + x = 2X
Average Speed = total length / total time
= 2X / ( X/60 + x/40 )
= 2 * 60 * 40 / (40 + 60)
= 48 km/hr
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