Question

if 4/5 of a cistern is filled in 1 minute how much time will be required to fill the empty cistern​

Answer 1

Answer:

time taken to fill 4/5 of a cistern is 60 sec

Step-by-step explanation:

so when we divide 4/60

we get the time taken to fill 1/5 of cistern

i.e 15 so it takes 15 seconds to fill 1/5 of cistern

therefore when we add 4/5 and 1/5 of the time taken to fill. then it'll be 15+60sec = 75 sec

i.e 1 minute and 15 seconds

Answer 2

Answer:

1 min 15 sec

Step-by-step explanation:

1 min ÷ 4=time taken to fill 1/5 of the cistern

= 60 sec ÷ 4

= 15 sec

so,5 × 15

= 75 sec = 1 min 15 sec