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     EduGorilla 
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    Three pipes X, Y and Z can fill a water cooler in 4 hours, 2 hours and 12 hours respectively. How many hours will it take to fill the water cooler if all the pipes are used?

    Options :-

    1. 0.5 hour
    2. 1 hour
    3. 1.2 hours
    4. 2 hours
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