Plea help me get the answer

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

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c