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Time & Work-Q116

  • Remaining Timing :-

(1). A village has a big public water tank is fitted with three pipes and let us name them X, Y and Z. Pipes X and Y can fill it in 5 and 4 hours respectively. Pipe Z can empty the cistern in 2 hour. One day the tank was cleaned completely and made empty. Then the pipes are opened at 2am, 4am and 5am respectively on the same day, find the time at which the tank will again be empty?

  • (a). 9pm
  • (b). 10pm
  • (c). 11pm
  • (d). 6pm
  • (e). None of these
Answer : 10pm

Explanation: