Time= distance*velocity
3=d*(vb+vs)
5=d(Vb-vs)
3/d= vb+Vs
5/d=Vb-Vs
add the equations
3/d + 5/d=2Vb
5d+3d=30Vb
solve for Vb
Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water
2 answers
speed of boat in still water ---- x mph
distance going upstream = 5(x-6)
distance going downstream = 3(x+6)
Are the distances not equal ?
distance going upstream = 5(x-6)
distance going downstream = 3(x+6)
Are the distances not equal ?