SOLUTION: One plane can travel 50 miles per hour faster than another. One of them goes 240 miles in same time it takes the other to go 165 miles. What are their speeds?

Question 664870: One plane can travel 50 miles per hour faster than another. One of them goes 240 miles in same time it takes the other to go 165 miles. What are their speeds?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Plane I x mph
Plane II 50 faster x + 50 mph

Plane I 165 miles
Plane II 240 miles
Plane I time = Plane II time
t=d/r
165 / x = 240 /( x + 50 )
cross multiply
165 ( x + 50 ) = 240 x
165 x + 8250 = 240 x
165 x - 240 x = -8250
-75 x = -8250
/ -75
x = 110 mph
Plane I 110 mph
Plane II 50 faster 110 + 50 =160 mph

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