Question
Aman travels from point A to point B at a speed of 20
m/s and then returns from point B to point A at a speed of 108 km/h. The total time for the round trip is 3 minutes. Find the distance between point A and point B.Solution
Returning speed = 108×5/18 = 30 m/s 
= 24 m/s Total covered distance = 24 × 3 minutes = 24×180 seconds = 4320 m
Law of diminishing returns only applies to cases where
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