An airplane starts from a and flies to b at a constant speed. after reaching b it returns to a at the same speed. there was no wind. assuming there was a wind from a to b of constant magnitude, when will the round trip take more time – when there is a wind or when there is no wind?

When there is wind it takes longer

Explanation:

With no wind, the round trip time is

When we have a constant wind speed w

comparing the reciprocal times;

This means that t1 is smaller than t2, ergo, it takes longer with wind

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