Wordpandit Question of the day
A cistern can be filled by two pipes filling separately in 12 min and 16 min respectively. Both pipes are opened together for a certain time but these are clogged. Because of this, only 7/8th of full quantity water flows through the former and only 5/6th through the latter pipe. The obstructions are suddenly removed and 3 minutes from that moment, the cistern is filled. How long was it before the full flow began?
a. 4.5 min
b. 2.5 min
c. 3.5 mn
d. 5.5 min