Math word problem check
posted by Shawn .
The Mad River flows at a rate of 3 km/h. In order for a boat to travel 78.2 km upriver and then return in a total of 8 hr, how fast must the boat travel in still water?
what formula would be used to solve this problem?
I used the formula of
V = D/T
T = D/V, you know that
78.2/(V + 3) + 78.2/(V - 3) = 8 hr.
Solve for V, the speed of the boat in still water.
Is the answer 10 km/h?