Two pipes A & B would fill a tank in 20 & 30 minutes respectively. Both pipes being open, find when A must be turned off so that tank may be just filled in 15 minutes.

Created: 8 years ago | Updated: 2 months ago
Updated: 2 months ago

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২৪ লিটার
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২৪০০লিটার
২৪০০০ লিটার
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