Question

Pipes & Cist
Q.19) Two pipes M and N can fill a tank in 30 and 45
minutes respectively. If both the pipes were open for a
minutes after which N was closed and the tank was full in
25 minutes, find the time for which pipe N was opened
[a] 8.16 min
[c] 5min
[b] 7.5 min
[d] 10.2 min
Q.20) Two pipes P and Q can fill a tank in 20 mins and​

Answer 1

Answer:

8.16 min write answer

Step-by-step explanation:

please branly