35 points: trigonometry: find each side marked with a letter. all lengths are in centimetres. kindly include the working since i know the answer. (26.2cm)

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

Rewrite so the subject can be y in the formula d=m-y/y+n

Use the distance formula to find the distance between (-3,5) and (3,1)