Question
Tap P can fill the tank in 5 hours and Tap Q can empty
it in `7(1/2)` hours. Tap P starts filling and they opened for 1 hour each alternatively. In what time will the tank be full?Solution
2 Hours = 1 work done 
Last work will be done by P Therefore, 15 -3 = 12 
Gross Profit Ratio for a firm remains same but the Net Profit Ratio is decreasing. The reason for this could be:
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