Two bicyclists started at the same time from towns 84km apar

Two bicyclists started at the same time from towns 84km apart and rode toward each other. Because one of them rode downhill, his speed was twice as great as that of the other. Find both speeds if they meet after two hours.

Solution

Let x=dist traveled by the slower bike.
2x+x=84
3x=84
x=28 mi
28mi/2h=14mi/h
28mi/h speed of the faster bike.