1.

A tank can be filled by a tap in 20 minutes and by another tap in 60 minutes. Both thetaps are kept open for 10 minutes and then the first tap is shut off. After this, how much time required to fill tank will be completely ? a.10 minb.15 min c.12 mind. 20 mm

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Here is your ANSWER...
OPTION (d) is CORRECT...
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