If 4/5 of a cistern is filled in 1 minutes,how many more time will be required to fill the rest of it ? unitary method
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Answer:15 seconds
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Unitary Method :-
Remaining portion = 1-4/5 = 1/5
Time taken to fill 4/5 of a cistern = 1 min
Time it will take to fill whole cistern = 5/4 min
Time it will take to fill remaining 1/5 of a cistern = 5/(4 x5) min = 1/4 min
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