Posted by Joel on Tuesday, February 22, 2011 at 9:08am.
Cody’s motorboat took 3 hr to make a trip downstream with a 6mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water

Algebra  Anonymous, Tuesday, February 22, 2011 at 9:24am
Time= distance*velocity
3=d*(vb+vs)
5=d(Vbvs)
3/d= vb+Vs
5/d=VbVs
add the equations
3/d + 5/d=2Vb
5d+3d=30Vb
solve for Vb

Algebra  Reiny, Tuesday, February 22, 2011 at 9:27am
speed of boat in still water  x mph
distance going upstream = 5(x6)
distance going downstream = 3(x+6)
Are the distances not equal ?
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