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OpenStudy (anonymous):
any help An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airplane in still air.
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OpenStudy (btaylor):
Make a table:|dw:1343750473007:dw| since d=d, we can set 4(r+25)=5(r-25) 4r+100 = 5r-125 r=225 mph
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