Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15 hours respectively. First A was opened. After 1 hour, B was opened and after 2 hours from the start of A, C also opened . Find the time in which the cistern is just full ?

Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15

1.	Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15 hours respectively. First A was opened. After 1 hour, B was opened and after 2 hours from the start of A, C also opened . Find the time in which the cistern is just full ?
A.	2 hrs.
B.	4 hrs.
C.	2 hrs. 52 min.
D.	4 hrs. 52 min.
Answer» E.

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