Math
A plane can fly 140 mph in calm air. Flying with the wind, the plane can fly 700 mi in the same amount of time it takes to fly 420 mi against the wind. Whats the rate of the wind?
asked by
Meghan

Let V be the wind speed. The flight time is D/(140+V)with a tail wind and
D/(140V) with a head wind.
Solve 700/(140+V) = 400/(140V)
98,000 700V = 56,000 +400V
1100V = 42,000
V = 38.2 km/hposted by drwls

Thanks
posted by Meghan
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