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Exercise:

Exercise 1

Q: A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half? 
A. 15 min B. 20 min
C. 27.5 min D. 30 min

Answer and Explanation

Answer:30 min

Explanation:

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