Question

A boat goes 6 km in an hour in still water. It takes thrice as much time in covering the same distance against the current. What is the speed of the current?

Answer 1

Speed of boat in still water = 6 km/hr 

Time taken by boat to move upstream = 3 hours 

∴ Speed of boat upstream = \(\frac63\) km/hr = 2 km/hr 

Let the speed of the current be \(x\) km/hr. 

Then, 6 – \(x\) = 2 ⇒ \(x\) = 4 km/hr.