motorcyclist drives from A to B with a uniform speed of 30 km per hour and return back with a speed of 20 km \ h . find the average speed ?
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Total distance from A to B = d km
Time from A -> B = d/30
Time from B -> A = d/20
Total time = d/30 + d/20
Average speed = Total distance / Total time
= 2d(d/20 + d/30)
=24kmph
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Ur answer hope it will be help you
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