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

- math -
**drwls**, Monday, February 7, 2011 at 5:46am
OK, it looks like you have chosen x for the rate in still water and y for the speed of the current. The equations you should have written are:

x + y = 70/8

x - y = 58/8

which is the same as you have written.

Adding them gives

2x = 128/8 = 16

x = 6 mph

y = 70/8 - 6 = 2.75 mph

You started the problem correctly and only needed to finish.

## Answer this Question

## Related Questions

- math - A salmon has to swim 25 miles upstream. It seems 7 miles each day and ...
- math - A salmon has to swim 25 miles upstream. It swims 7 miles each day and ...
- Math 111 - It takes a motorboat 1 1/3 hours to go 20 miles downstream and 2 2/9 ...
- math - Solve the problem. A cruise boat travels 48 miles downstream in 3 hours ...
- Algebra - The time required for a trip 108 miles downstream on a steamer is 3 ...
- Algebra. Please help(: - The time required for a trip 108 miles downstream on a ...
- Math - Austin is in his pedal boat. It takes him 1.5 hours to travel 12 miles ...
- Math - Julie and Eric row their boat (at a constant speed) 21 miles downstream ...
- Physic - Salmon, swimming up the Fraser river to their spawning grounds, leap ...
- Physics - Salmon, swimming up the Fraser river to their spawning grounds, leap ...

More Related Questions