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.
A. After 10 minutes
B. After 20 minutes
C. After 15 minutes
D.
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সঠিক উত্তরঃ
A.
After 10 minutes
Explanation:
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