Question

if 4 by 5 of a cistern is filled in 1 minute how much more time will be required to fill the rest of it

Answer 1

in this problem

4
-- cistern filled means
5

remaining will be

total cistern is 1 unit

1 - 4/5 = 1/5


4/5 in 1 minuts

then 1/5 to haw much time

1/5 ÷ 4/5

0.2 ÷ 0.8 = 0.25 minutes

= 15 second

Answer 2

Answer:

15 seconds

Step-by-step explanation:

given 4/5 of x is filled in 60 seconds

so the rest of it I.e. 1/5 takes a minute to fill

= 60×1/5/4/5

= 60/4

= 15 seconds

So, to fill the rest of the cistern it takes 15 seconds