Homework Help: math

Posted by allan on Tuesday, January 26, 2010 at 9:58pm.

an aircraft flew at 400km/h to its destination and returned at 500km/h. If the total trip took 9h, how far did it fly?

The answer is 2000km but how

math - bobpursley, Tuesday, January 26, 2010 at 10:04pm
distancethere=400*t
distanceback=500(9-t)
but the distances are the same
400t=500*9-500t
900t=5*900
t= 5 hrs
distance there= 400*5=2000km

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