SOLUTION: two cyclists start from the same point and ride in opposite deirections. ONe cyclist rides twice as fast as the the other. In 3 hours they are 81 miles apart. Find the rate of each

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Question 161347: two cyclists start from the same point and ride in opposite deirections. ONe cyclist rides twice as fast as the the other. In 3 hours they are 81 miles apart. Find the rate of each cyclist.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
3x+3*2x=81
3x+6x=81
9x=81
x=81/9
x=9 mph for the slower biker.
2*9=18 mph for the faster biker.
Proof:
3*9+6*9=81
27+54=81
81=81