1. A tank can be filled by pipes P1 and P2 in 12 minutes and 10 minutes respectively. The full tank can be emptied by a third pipe P3 in 8 minutes only. If all the pipes be turned on at same time, the tank will be full in–
1) 17 1/7 min
2) 19 min
3) Other than given options
4) 16 min
5) 20 min
2. In what ratio must 25% milk be mixed with 50% milk to get a mixture of 40% milk strength
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