Two bicycles depart from Miami Beach going in opposite directions. The first bicycle is traveling at
10 miles per hour. The second bicycle travels at 5 miles per hour. How long does it take until the bikes are 45 miles apart?

Question

Two bicycles depart from Miami Beach going in opposite directions. The first bicycle is traveling at 
10 miles per hour.  The second bicycle travels at 5 miles per hour. How long does it take until the bikes are 45 miles apart?

anonymous · Answer

|dw:1374225894795:dw|

or, in the terms of equations, first bike moves 10 miles/h and the second bike moves 5 miles/h. the question is when will they be 45 miles apart.

they equation will be:
10*x + 5*x = 45

can you finish from here?
if you have any more questions, feel free to ask;)