Pipe A fills a tank at the rate of 100lit/min, Pipe B fills a tank at

Pipe A fills a tank at the rate of 100lit/min, Pipe B fills a tank at the rate of 25 lit/min, and pipe C drains a tank at the rate of 50 lit/min. First pipe A is opened for 1 minute and then closed, after that pipe B is opened for 1 minute and then closed, after that pipe B is opened for 1 minute and then closed. If this continues till a 7000-litre empty tank is filled to the capacity, how long will it take to fill the tank ?

A. 275 minutes
B. 276 minutes
C. 277 minutes
D. 278 minutes
E. 279 minutes


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