SOLUTION: A plane can fly 700 miles in the same time as it takes a car to go 300 miles. If the car travels 80 mph slower than the plane, find the speed of the plane.

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Question 710824: A plane can fly 700 miles in the same time as it takes a car to go 300 miles. If the car travels 80 mph slower than the plane, find the speed of the plane.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +t+ = the time in hours for a plane fly 700 miles and a car to go 300 miles
+700%2Ft+ = the plane's speed in mi/hr
+300%2Ft+ = the car's speed in mi/hr
given:
+700%2Ft+-+300%2Ft+=+80+
+700+-+300+=+80t+
+80t+=+400+
+t+=+5+
and
+700%2Ft+=+700%2F5+
+700%2Ft+=+140+
The speed of the plane is 140 mi/hr
check answer:
+700%2Ft+-+300%2Ft+=+80+
+700%2F5+-+300%2F5+=+80+
+140+-+60+=+80+
+80+=+80+
OK