ibps-so 2018 · Question 302 of 356

A ferry operator who had applied for a loan to replace the engine of his motor boat was asked by the appraising o cer to state the times taken by the boat upon the stretch of the river over which he plies it daily, so that the power of the new engine might be judged against the current it will have to meet. He stated that the boat covers 60 kilometres downstream, that is with the current, in 2 hours and 30 minutes, and that upon the return journey, against the very same current, it covers 36 kilometres in 3 hours. The current is of the same strength throughout the stretch and the engine is worked at the same power in both directions. What is the speed of the current of the river?

1. A4 kilometres an hour
2. B5 kilometres an hour
3. C8 kilometres an hour
4. D7 kilometres an hour
5. E6 kilometres an hourCorrect