SOLUTION: A plane can fly 640 miles in the same time as it takes a car to go 280 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: A plane can fly 640 miles in the same time as it takes a car to go 280 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.       Log On


   

Question 1095248: A plane can fly 640 miles in the same time as it takes a car to go 280 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
T=D%2FR, Time, Distance, Rate

PLANE
640%2Fr

CAR
280%2F%28r-90%29

Solve for r, in 640%2Fr=280%2F%28r-90%29