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► MCQ Exam ON : Environmental Protection

Three pipes A, B and C can fill a tank in 15 minutes, 20 minutes and 30 minutes respectively. The pipe C is closed 6 minutes before the tank is filled. In what time will the tank be full?(CTS COMPANY)

1)		8 min
2)		5 min
3)		12 min
4)		6 min
5)		NULL

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