A boat takes twice time to go in upstream then the time taken by it to cover a certain distance in downstream. If speed of current is 3 km/hr then find the speed of boat in still water.
Answer & explanation
Correct answer: option 3
Upstream(U.S.) : Downstream (D.S.)
Time : 2 : 1
Speed : 1 : 2
Therefore,
Current : Boat in still water
Speed : (D.S.- U.S.) : (D.S. + U.S.)
1 : 3
1R = 3km/hr (given)
3R = 3 × 3 = 9km/hr