Question

If 4/5 of a cistern is filled in 1 minute , how much time will be required to fill most of it

Answer 1

Answer:

Cistern filled in 60 secs= 4/5

time taken to fill  it completely=  5/4 x 60

                                                  = 5 x 15

                                                  = 75 secs= 1 min 15 secs

Answer 2

Answer:

4/5th of cistern is filled in one minute.

Therefore whole cistern will be filled in 5/4th minute =5/4*60seconds

=5×15seconds

=75seconds

That is equal to 1 minute and 15 seconds

HOPE IT HELPS YOU....