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⁞ Pipes And Cisterns

Aptitude ➤ Pipes And Cisterns ➤ 1
Question 1
Q1.  Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
 

Answer :  120 gallons
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