SOLUTION: A boat travels 12 km upstream in 2 hr. If the return trip takes 1 hr, find the speed of the boat.

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Question 451530: A boat travels 12 km upstream in 2 hr. If the return trip takes 1 hr, find the speed of the boat.
Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
r*t=d
2*(r-c)=12
1*(r+c)=12
r-c=6
r+c=12
add
2r=18
r=9 kph boat
r+c=12
c=3 kph current
check
2*(9-3)=12
2*6=12
ok