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1. A boat moves downstream at the rate of one km in 5 minutes and upstream at the rate of 4 km an hour. What is the velocity of the current?
4 km/hr | 2 km/hr | 3 km/hr | 1 km/hr |
2. A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
4 km/hr | 6 km/hr | 8 km/hr | Data inadequate |
8. Two pipes A and B can fill a tank in 10 hrs and 40 hrs respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?
8 hours | 6 hours | 4 hours | 2 hours |
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