SOLUTION: Mark can ride 16 kilometres on his bicycle in the same time it takes him to walk 7 kilometers. If his riding rate is 5 kilometers per hour faster than his walking rate, how fast

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Question 1173556: Mark can ride 16 kilometres on his bicycle in the same time it takes him to walk 7
kilometers. If his riding rate is 5 kilometers per hour faster than his walking rate, how
fast does he walk?
Answer by ikleyn(52800) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let x be Mark's walking rate, in km/h

Then his riding rate is (x+5) km/h.


The "time" equation is


    16%2F%28x%2B5%29 = 7%2Fx.


Cross multiply


    16x = 7*(x+5)


    16x = 7x + 35

    16x - 7x = 35

       9x    = 35

        x    = 35%2F9 km/h = 3.889 km/h.    ANSWER

Solved.