Two identical taps fill 2/5 of a tank in 20 minutes.when one of the taps goes dry n how many minutes will the remaining one tap fill the rest of the tank?
A. 5 min
B. 10 min
C. 60 min
D. 20 min
E. None of these
সঠিক উত্তরঃ
C.
60 min
Explanation:
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