What is 10k+-1=4k+-43 and how?

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

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

What is the measure of one interior angle of a pentagon