Question

A plane can travel 36 km against the wind and 80 km with the wind in 4 hours. How much percent is the speed of the plane against the wind less than the speed with the wind, considering it can travel 168 km against the wind and 128 km with the wind in 11 hours?

A 12%
B 15%
C 45%
D 25%
E none of these
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