Do 5 + x and x + 5 represent the same expression?

What is the simplified expression for 6(2(y+x))

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

Divide. write in the simplest form. 4 1/6 divided by 10