General TestPipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe A is closed, how much time B will take to fill the remaining tank?

Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe A is closed, how much time B will take to fill the remaining tank?

  1. A

    225 hours 

  2. B

    712 hours 

  3. C

    213 hours 

  4. D

    313 hours 

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    Solution:

    A+B=1 26+2+x8=1

    x=313 hours. 

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