Question

Salmon hatch in freshwater streams and then migrate 70 miles downstream to the ocean in 8 hours. After reaching spawning age, they return upstream to fresh water to spawn and usually die soon after. If the salmon travel 58 miles in 8 hours during the upstream trip, find the rate of the salmons’ swimming in still water and the rate of the current?

Answers

if the salmon's speed is s, and the current's speed is c, then
since distance = speed * time,
(s+c)*8 = 70
(s-c)*8 = 58
now solve as usual

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