document.write( "Question 932111: it takes an airplane 1 hr 30 min to fly 600 km against the wind. The return trip with the wind takes only 1 hr. Find the total flying time for the round trip if there was no wind? \n" ); document.write( "
Algebra.Com's Answer #565958 by ewatrrr(24785)\"\" \"About 
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r + w = 600kph \"600k%2F%281hr%29\"
\n" ); document.write( "r - w = 400kph \"600k%2F%281.5hr%29\"
\n" ); document.write( "2r = 1000kpr
\n" ); document.write( "r = 500kph, the speed of the plane
\n" ); document.write( "....
\n" ); document.write( "w/o wind
\n" ); document.write( "t = 600k/500kph = 1.2 hr
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