Hellow guys, Welcome to my website, and you are watching Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B. and this vIdeo is uploaded by PRAVESH SIR CLASSES at 2023-07-19T22:19:50-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.