Two taps A and B can fill a tank in 10 hours and 15 hours respectively. Both the taps are opened for 4 hours and then B is turned off. The time taken by A to fill the remaining tank is

  • 10/3 hours
  • 6 hours
  • 13/10 hours
  • 12/5 hours

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Two taps A and B can fill a tank in 10 hours and 15 hours respectively. Both the taps are opened for
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