A plane can fly 980 miles in the same time as it takes a car to go 420 miles. If the car travels 80 mph slower than the plane, find the speed of the plane.

Solution

Solution

plan e^{'} s speed : 140

Solution steps

Translate the problem into an equation:

\frac{980}{x} = \frac{420}{x - 80}

Solve for

x, \frac{980}{x} = \frac{420}{x - 80} : x = 140

plan e^{'} s speed : 140

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