ibps-so 2016 · Question 93 of 394

The river upon which a bank's oating branch is worked ows at a uniform 3 kilometres an hour. The launch that serves that branch, whose engine is opened out to one and the same extent whichever way it is headed, is found to make 60 kilometres with the current in exactly the time that it needs for 40 kilometres against the current. How long will that launch take to go 90 kilometres down the river from its moorings and to return by the same water to the moorings again?

1. A10 hours
2. B11¼ hours
3. C12 hours
4. D12½ hoursCorrect
5. E13½ hours