SOLUTION: I can run 3 times faster than I can walk. One day I walked for 2 hours and ran for 30 mins. If I travelled 21.7 km, how fast can I walk. Use algebra to solve.

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Question 1024586: I can run 3 times faster than I can walk. One day I walked for 2 hours and ran for 30 mins.
If I travelled 21.7 km, how fast can I walk. Use algebra to solve.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Rate, time, distance related in RT=D, the basic travel rate rule. 

            rate        time           distance

WALK         r           2             highlight_green%28%28r%29%282%29%29

RUN         3r           1%2F2         highlight_green%28%283r%29%281%2F2%29%29

Total                                    21.7

Sum of the distances gives the equation to solve.