SOLUTION: A rowing team practices rowing 2 miles upstream and 2 miles downstream. The team can row downstream 25% faster than they can row upstream. Let r represent their rate upstream. Writ

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Question 450441: A rowing team practices rowing 2 miles upstream and 2 miles downstream. The team can row downstream 25% faster than they can row upstream. Let r represent their rate upstream. Write and simplify an expression for the amount of time they spend rowing.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A rowing team practices rowing 2 miles upstream and 2 miles downstream.
The team can row downstream 25% faster than they can row upstream.
Let r represent their rate upstream.
Write and simplify an expression for the amount of time they spend rowing.
:
Let r = rowing speed upstream
then
1.25r = rowing speed downstream
:
Write a time equation; time = dist/speed
rowing time = 2%2Fr + 2%2F%281.25r%29
simplify
r.t = %282%281.25r%29%2B2r%29%2F%28r%2A1.25r%29 = %282.5r%2B2r%29%2F%281.25r%5E2%29 = %284.5r%29%2F%281.25r%5E2%29
cancel r
r.t. = 4.5%2F%281.25r%29, simplified expression for time spent rowing