SOLUTION: A person walking 5/6 of his usual rate is 40 minutes late.What is his usual time?

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Question 975885: A person walking 5/6 of his usual rate is 40 minutes late.What is his usual time?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
normal time, t;
normal rate, r;
rt=d for expected known d.

%285%2F6%29r%2A%28t%2B2%2F3%29=d;

Value for distance d is same for both situations.
rt=%285%2F6%29r%28t%2B2%2F3%29
Divide left and right by r;
t=%285%2F6%29%28t%2B2%2F3%29
18t=5%2A3%28t%2B2%2F3%29
18t=15t%2B10
3t=10
highlight%28t=10%2F3%29 usual time in hours