Question 853205
A + B = 81 (the total distance they'll travel)
A = 2B (One cycles 2 times as fast as the other)
Substitute the known value of A into the first equation.
2B + B = 81
3B = 81
Divide by 3 to find the distance B travels.  81/3 = 27
If B's distance is 27 miles, then A's distance is 54.  27+54 does equal 81.
If B travels 27 miles in 3 hours, how many miles per hour?  27/3 = ???
If A travels 54 miles in 3 hours, how many miles per hour?  54/3 = ???