CLAT 2017 Question Paper with answer key for online practice

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Question : 103 of 200
 
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Taps ‘A’ and ‘B’ can fill a tank in 37 ½ minutes and 45 minutes respectively. Both taps are opened and after some time tap ‘B’ is turned off.The tank is filled completely in exactly 30 minutes, if tap ‘B’ is turned off after:
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