A ferry runs at 26 km/hr when it goes downstream. The speed of the current is 5 km/hr. What is the speed of the ferry when it goes upstream?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 16 km/hr
The downstream speed already has the current added to the ferry’s own speed. Taking the current away once gives the speed in still water; taking it away again gives the upstream speed.
Speed of the ferry in still water \(=26-5=21\) km/hr
Upstream speed \(=21-5=16\) km/hr