Question 70536
A plane took 1 hour longer to travel 560 miles on the first portion of a flight than it took to fly 480 miles on the second portion. If the speed was the same for each portion, what was the flying time for the second portion of the trip?

480/t = 560/t+1
480(t+1) = 560/t
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Cross multiply to get:
480t = 560(t+1)
480t= 560t +560
-80t=560
t=-70
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This doesn't make any sense.  
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Try this:
1st portion:
distance = 560 miles ; rate = r mph ; time = 560/r hrs.
2nd portion: 
distance = 480 miles ; rate = r mph ; time = 480/r hrs.
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EQUATION:
longer time - shorter time = 1 hr
560/r - 480/r = 1
Multiply thru by r to get:
560-480=r
r=70 mph.
Cheers,
Stan H.