Question: 
A pipe fills a tank in P minutes and another pipe fills the tank in q minutes, A different pipe makes the tank empty in r minutes. If all these tree pipe are opened then in how many minutes the tank will be full ?
(pq + qr - pr) / pqr
None
(p + p - q) / pqr
(pq + pr - pq) pqr
pqr/(qr + pr - pq)
Answer: 
pqr/(qr + pr - pq)
Last Updated: 
27/04/2021 - 22:05