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April 17, 2014

Homework Help: math

Posted by alicia on Monday, February 7, 2011 at 4:38am.

need help.

Young salmon hatch in freshwater steams and then migrate downstream to the ocean at the rate of 70 miles in 8 hours. there they live until they reach spawning age. then they return upstream to fresh water to spawn and usually die soon after. on the upstream trip, the salmon travel about 58 miles in 8 hours. find the rate of the salmon swimming in still water and the rate of the current.
this is what I have so far, but it doesnt add up

r*t=d
downstream= 8(x+y)=70
upstream=8(x-y)=58

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