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    Pipe A and B can fill a tank in 10 hours and 8 hours respectively. After certain time, pipe A was closed. It took a total of 6 hours to fill the tank completely. For how many hours did pipe A work

  • 4 ¼ hours
  • 2 ½ hours
  • 3 1/3 hours
  • 5 1/3 hours
  • 6 ½ hours
  • Explanation:

    Suppose, A did the work in x hours.

    According to question,

    x/10+6/8=1

    ⇒ x/10+3/4=1

    ⇒ x/10=1/4

    ⇒x=10/4=5/2

    ⇒x=2 1/2 hours


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