A boat can move at 30 mph in still water. Water is flowing in a river at 5 mph. What is the time taken by the boat to go 3 miles from A to B…

A boat can move at 30 mph in still water. Water is flowing in a river at 5 mph. What is the time taken by the boat to go 3 miles from A to B…

A boat can move at 30 mph in still water. Water is flowing in a river at 5 mph. What is the time taken by the boat to go 3 miles from A to B…

A boat can move at 30 mph in still water. Water is flowing in a river at 5 mph. What is the time taken by the boat to go 3 miles from A to B…
In still water, the boat can move at 30 mph. Water is flowing in the river at 5 mph. When the boat moves against the stream its speed is reduced to 30 – 5 = 25 mph and when it moves with the stream the speed of the boat is 30 + 5 = 35 mph.For a speed v, the time required to travel a distance d is given by t = d/v. When the boat goes from point A to point B, a distance of 3 miles, and back the total time required is equal to 3/25 + 3/35 = 36/175 hoursThe boat requires 36/175 hours to travel from A to B and back.