Q16Short answer
A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h–1. Find its average speed.
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Let AB = x, So t1=, and t 2 = 30 20 5x Total time = t 1 + t2 = h. Total distance 2 x Average speed for entire journey = = = 24 km h –1 Total Time 5 x