SOLUTION: A butterfly flew 4 mi. with the wind in 1 hr. It returned against the same wind in 1 hr. 15 min. Find the rate of the wind.

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Question 1110478: A butterfly flew 4 mi. with the wind in 1 hr. It returned against the same wind in 1 hr. 15 min. Find the rate of the wind.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
r, speed without wind
w, speed of the wind

system%28r%2Bw=4%2Cr-w=4%2F%281%261%2F4%29%29

system%28r%2Bw=4%2Cr-w=16%2F5%29

Use Elimination Method...

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system%28r=3%263%2F5%2Cw=2%2F5%29