SOLUTION: Mark Martin can row upstream at 5 MPH and downstream at 11MPH. If mark starts rowing upstream until he gets tired and then rows downstream to his starting point, how far did mark r

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Question 1047302: Mark Martin can row upstream at 5 MPH and downstream at 11MPH. If mark starts rowing upstream until he gets tired and then rows downstream to his starting point, how far did mark row if the entire trip took for hours.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Trip took how many hour? Omitted. Let this be T.
Unknown distance each way may be d. 
               SPEED         TIME            DISTANCE

UPSTREAM         5           %28d%2F5%29            d

DOWNSTREAM       11          %28d%2F11%29           d

Total                        T               2d


11d%2F55%2B5d%2F55=T
d%2811%2B5%29%2F55=T
d%2816%2F55%29=T
d=%2855%2F16%29T

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Did you mean, "...the entire trip took FOUR hours." ? In that case, you would have T=4, and you can then evaluate d.