Enter an equation that can be used to solve this problem, where x represents the number of hours that the first plane had been traveling.

Two planes left the same airport traveling in opposite directions. The first plane left the airport at 2 P.M. traveling at an average rate of 500 mph. The second plane left the airport at 4 P.M. traveling at an average rate of 550 mph. When will the planes be 3100 miles apart?

Enter the amount hours, after the first plane left, when the planes will be 3100 miles apart.

Equation:
Hours: