An airplane

Question:

An airplane flies in a straight line from airport A to airport B, then back in a straight line from B to A. It travels with a constant engine speed and there is no wind. Will its travel time for the same round trip be greater, less or the same if, throughout both flights, at the same engine speed, a constant wind blows from A to B?

.

.

C

A

P

T

A

I

N

I

N

T

E

R

V

I

E

W

.

.

Solution:

The time during which the plane’s speed is boosted is shorter than the time during which it is retarded, so the overall effect is of retardation. Consider the example when plane’s speed is same as wind. In one direction, plane’s speed doubles, while in the other, it becomes zero! (i.e. it takes infinite time to finish the journey!)

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