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pipe and tank question solved SSC

Pipe A alone can fill a tank in 8 hours. Pipe B alone can fill it in 6 hours. If both the pipes are opened and after 2 hours pipe A is closed,  then the other pipe will fill the tank?
a.    6 hours
b.    3.1/2 hours
c.     4 hours

d.    2.1/2 hours


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