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11. Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

16 hours | 18 hours | 20 hours | 24 hours |

14. If a mans rate with the current is 15 km/hr and the rate of the current is 11/2 km/hr, then his rate against the current is

12 km/hr | 10 km/hr | 10.5 km/hr | 12.5 km/hr |

15. The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?

8 hours | 6 hours | 4 hours | 5 hours |

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Total | Ans | ||