Homework Help: College math

Posted by Kim on Tuesday, January 20, 2009 at 11:21pm.

A planehas 7 hrs. to reach a target and come back to base. it flies out to the target at 480 miles per hr. and returns on the same route at 640 miles per hour. how many miles from the base is the target?

College math - Reiny, Tuesday, January 20, 2009 at 11:30pm
let the time for the "out-trip" be t hours
then the return trip took 7-t hours

so first distance = 480t miles
return distance = 640(7-t)miles

but aren't the two distances equal ?
so solve

480t = (640(7-t)

then sub your value of t into 480t

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