Given:
The current of a river is 2 miles per hour. A boat travels to a point 8 miles upstream and back in 3 hours.
Required:
What is the speed of the boat in still water?
Step-by-step explanation:
A boat has to travel 8 miles against the current and 8 miles with the current.
Ustream(against the current) the boat's speed is:
speed in still water - current OR x - 2.
Downstream( with the current) the speed is:
speed in still water + current speed OR x + 2.
We know the distance
OR
The total time is 3 hours
The time upstream + The time downstream = 3 hours