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Question
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opended together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
10 min 20 sec
11 min 45 sec
12 min 30 sec
14 min 40 sec
ANSWER : 4
Descrption
<p>By pipe A and B</p> <p>Part filled in 4 minutes = 4×( 1/15 + 1/20) = 7/15 </p> <p>Remaining part = 1 - 7/15 = 8/15</p> <p>part filled by B in 1 minute = 1/20</p> <p>By B, </p> <p>1/20 part can be filled in 1 minute</p> <p>8/15 part can be filled in ( 20×8)o/15 = 10 min 40 sec</p> <p>So, total time required ( 4 min + 10min 40 sec) = 14 min 40 sec. </p>
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