1.

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

Answer»

Let distance = X

Total Distance = x + x = 2x

Time = x / 20 + x/ 30 = 5x / 60

Average SPEED = Total Distance / Total Time

2x / (5x /60) = 2x * 60 / 5x = 24 KM / hr



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