The speeds of a boat along the current and against the current are 10 km/h and 8 km/h respectively. What is the speed of the current?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 1
Going with the current, the boat’s speed in still water and the speed of the current add; going against it, the current’s speed is subtracted. The difference of the two speeds is therefore twice the speed of the current.
Boat \(+\) current \(=10\) km/h; boat \(-\) current \(=8\) km/h
Speed of the current \(\displaystyle=\frac{10-8}{2}=1\) km/h