DSSSB · Mathematics
A tank has three pipes A, B, and C. A and B can fill it in 10 and 15 hours, respectively, while C can empty it in 30 hours. Initially, the tank is half full. Pipes A and C are opened simultaneously for 2 hours, then closed. Then pipe B alone is opened. For how many hours should B alone remain opened to fill the tank completely?
- 6 hours
- 5 hours
- 6 1/2 hours
- 5 1/2 hours
A tank has three pipes A, B, and C. A and B can fill it in 10 and 15 hours, respectively, while C can empty it in 30 hours. Initially, the tank is half full. Pipes A and C are opened simultaneously for 2 hours, then closed. Then pipe B alone is opened. For how many hours should B alone remain opened to fill the tank completely?
- 6 hours
- 5 hours
- 6 1/2 hours
- 5 1/2 hours
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