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If two pipes function together, the cistern will be filled in 6 hrs.  One pipe fills the cistern 5 hrs. faster than the other.  How many hours it take the second pipe to fill the cistern?

/ Basic Maths Mcqs, Mathematics Mcqs, Time and Work Mcqs / By
If two pipes function together, the cistern will be filled in 6 hrs.  One pipe fills the cistern 5 hrs. faster than the other.  How many hours it take the second pipe to fill the cistern?

A. 5 hrs
B. 10 hrs
C. 15 hrs
D. 20 hrs