I would really like to have some help and know how to do this

Can someone me with my hwplz(only the circled ones)

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

5x−4≥12 or 12x+5≤−4 can you with this problem