The boat covered the distance between two piers along the river in 3 hours and against the current in 4 hours.

The boat covered the distance between two piers along the river in 3 hours and against the current in 4 hours. What is the distance between these piers if the river speed is 2 km / h?

When the ship is sailing with the current, the speed of the river is added to the speed of the ship, and against the current it is subtracted
Let’s make an equation, take the speed of the ship as x
From the formula, distance = speed over time:
distance = 3h * (x + 2) km / h
distance = 4h * (x-2) km / h
Distance one – equate
3 * (x + 2) = 4 * (x-2)
3x + 6 = 4x-8
14 = x – speed
We find the distance using one of the formulas: 3 * (14 + 2) = 3 * 16 = 48 km