Question 1143009

A plane can fly 280 miles in the same time as it takes a car to go 100 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.
<pre>Let speed of plane be S
Then speed of car  = S - 90
We then get the following TIME equation: {{{matrix(1,3, 280/S, "=", 100/(S - 90))}}}
Cross-multiply to get: 280(S - 90) = 100S
Continue to solve for S, and you should get: {{{highlight_green(matrix(1,8, "S,", or, speed, of, plane, "=", 140, mph))}}}