Homework Help: math

Posted by val on Tuesday, December 4, 2012 at 2:21pm.

A pilot can fly an MD-11 2160 miles with the wind in the same time she can fly 1920 miles against the wind. If the speed of the wind is 30 mph, find the speed of the plane in still air.( Source: Air Transport Association of America)

math - Steve, Tuesday, December 4, 2012 at 2:50pm
time = distance/speed
since the times are the same,

2160/(s+30) = 1920/(s-30)
s = 510 mph

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