What are the value of m and o in the diagram below?

Graph the equation by plotting point x=2

Two cyclists 84 miles apart start riding toward each other at the samen 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 cyclists

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'