SOLUTION: with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.

Question 606520: with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.
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Distance = 30 mi ; time = 48/60 = 4/5 hr ; rate = distance/time = 30/(4/5)
= 150/4 = 37.5 mph
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plane speed - wind speed = 37.5
plane speed - 20 = 37.5
plane speed in still air = 57.5 mph
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Cheers,
Stan H.

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