If 4/5th of a cistern is filled in 20 minutes, then what is the time (in minutes) needed to fill the remaining part?

If 4/5th of a cistern is filled in 20 minutes, then what is the time (

1.	If 4/5th of a cistern is filled in 20 minutes, then what is the time (in minutes) needed to fill the remaining part?
A.	5
B.	10
C.	25
D.	15
Answer» B. 10

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If 4/5th of a cistern is filled in 20 minutes, then what is the time (in minutes) needed to fill the remaining part?

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