Question 982598
r, normal rowing speed
w, the effect of speed of wind
t, amount of time for given paths
u, distance WITH the wind
v, distance AGAINST the wind
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Unknowns assumed to be t and r.
GIVEN: {{{system(w=4,u=34,v=18)}}}



___________________rate____________time___________distance
WITHWND____________r+w______________t______________u
AGAINSTWND_________r-w______________t______________v



{{{system(t=u/(r+w),t=v/(r-w))}}}


{{{u/(r+w)=v/(r-w)}}}


{{{u(r-w)=v(r+w)}}}


{{{ur-uw=vr+vw}}}


{{{ur-vr=vw+uw}}}


{{{(u-v)r=vw+uw}}}


{{{highlight(r=(vw+uw)/(u-v))}}}