SOLUTION: My question is a systems d=rt. I have tried but failed to solve it.
A salmon swims 200m in 12 minutes downstream. Swimming in the opposite direction it takes that fish 15 minut
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Question 915070: My question is a systems d=rt. I have tried but failed to solve it.
A salmon swims 200m in 12 minutes downstream. Swimming in the opposite direction it takes that fish 15 minutes to travel the same distance. Find the rate of swimming for the fish and the rate of the current. Thanks in advance and hopefully I get the answer (or at least help) fast.
Found 2 solutions by josgarithmetic, richwmiller:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
r, salmon rate when no stream current
c, stream current speed
_________________rate_________time_________distance______equation
downstream_______r+c__________12___________200___________
upstream_________r-c__________15___________200___________
Two linear equation in the two unknown variables, r and c.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
r*t=d
with the current
(r+c)*12=200
(r+c)=200/12
r+c=16.6666667
against the current
(r-c)*15=200
(r-c)=200/15
r-c=13.3333333
r+c=16.6666667
add
r+r=16.6666667+13.3333333
2r=30
r=15 mpm rate
15-c=13.3333333
c=15-13.3333333
c=1.66666667 mpm current
check
(15+1.66666667)*12=200
16.6666667*12=200
200.0=200
ok
(r-c)*15=200
(15-1.66666667)*15=200
13.3333333*15=200
200.0=200
ok
codedrtdtt
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