Two cyclists 84 miles apart, start riding toward each other at the same time. One cycles 2 times as fast as the other. If they meet 4 hours later what is the speed (in miles) of the faster cyclist?

Answer 1

so, if the slower one's speed is x, then together they cover 3x mi/hr
since distance = speed * time,
3x*4 = 84

Answer 2

Speed of slowest cyclist = X mi/h.
Speed of Fastest cyclist = 2x mi/h.

d = 4*x + 4*2x = 84.
4x + 8x = 84,
12x = 84,
X = 7 mi/h.
2x = 14 mi/h.