A boat race takes place in Detroit every summer. The first boat to travel 3 miles upstream and back will win the race. If the river has a current of 4mph, what is the speed of the boat in still water, if the winner of the race took a total 1 hour?

The speed of the boat in still water u = 8

Step-by-step explanation:

Let speed of the boat = u

Speed of the current = v = 4

Given that the first boat to travel 3 miles upstream and back in a total 1 hour.

So

Since v = 4

By solving above equation

u = 8 , - 2

Since u = -2 is not valid.

⇒ u = 8

This is the speed of the boat in still water.