two plains left an airport at the same time and flew in oppo

two plains left an airport at the same time and flew in opposite directions. the rate of the Boeing was twice that of the Airbus. after 3 hours they were 2250 miles apart. wahat was the rate of the faster plane?

Solution

3(x+2x)=2,250
3*3x=2,250
9x=2,250
x=2,250/9
x=250 mph. for the Boeing plane.
2*250=500 mph. for the Airbus plane.