Question

16
(c) i hours
hours
hours
12. Two pipes M and N can fill a pool in
40 minutes and 60 minutes respectively.
The entire pool can completely be emptied
by another pipe P in 30 minutes. M, N and
Pare opened alternatively and each is kept
open for just 1 minute. In how much time
will the pool be filled?
(a) 120 min (b) 14 min
(c) 24 min
(d) 30 min
3. A pipe can fill a tank in x hours and another​

Answer 1

Answer:

according to question one minute status of the tank, when each one m ,n and p pipes opened alternatively

(1/40+1/60-1/30)

after solving this we get 1/120 portion of the tank will fill up in one minute. so total tank will fill up in 120 minute. so according to me option A is correct