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Question

  1. Two pipes X and Y can separately fill a cistern in 18 hours and 24 hours respectively. If they are turned on alternately for one hour each, how long will it take to fill the cistern?

Options:
A .  20 hr.
B .  20 hr. 30 min.
C .  21 hr. 
D .  21 hr. 30 min.
Answer: Option B

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