- 04/24/2019 at 9:41 am #593269EduGorillaKeymasterSelect Question Language :
Two pipes A and B, when working singly, can fill a tank in 36 minutes and 45 minutes respectively. A waste pipe, C, can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. How many minutes will it take to fill the tank?
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