SOLUTION: Rip skates across a lake at 10mph and returns at 8 mph of his total skating time is 1 hour. How wide is the lake? Thank you!

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Question 1165697: Rip skates across a lake at 10mph and returns at 8 mph of his total skating time is 1 hour. How wide is the lake?
Thank you!
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let "d" be the lake's width.


Then you have this "time" equation


    d%2F10 + d%2F8 = 1   hour.


Multiply both sides by 40


    4d + 5d = 40

    9d      = 40

     d      = 40/9 = 4 4%2F9  miles.     ANSWER

Solved.