Question 1111037
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A crew rowed 7 miles upstream in 2 hours and the 6 1/2 miles downstream in 1 hour. Find the rate of the crew in still water and the rate of the current.
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A crew rowed U miles upstream in h hours and the D miles downstream in k hour. Find the rate of the crew in still water and the rate of the current.
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r, speed of crew if no current
c, speed of the current
U=7
D=6.5
h=2
k=1


{{{system(r-c=U/h,r+c=D/k)}}}

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{{{r=(Uk+Dh)/(2hk)}}}   and    {{{c=(Dh-Uk)/(2hk)}}}


You can just substitute the values to compute r and c.