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Question
A tank can be filled by a tap in 20 minutes and by another tap in 60 minutes . Both the taps are kept open for 10 minutes and then the first tap is shut off. After this , the tank will be completely filled in what time ?
10 min
15 min
20 min
25 min
ANSWER : 1
Descrption
<p>In 10 minutes two taps cal fill = ( 10/20 + 10/60) portion = ( 1/2 + 1/6) = ( 3 + 1 /6) = 2/3 portion.</p> <p> Remaining portion ( 1 - 2/3) = 1/3 </p> <p>2nd tap 1/60 portion can fills in 1 minutes</p> <p>2nd tap 1/3 portion can fills in = 60/3 minutes = 20 minutes </p>
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