Free Practice Question
PS · Problem Solving
655-705
Work Rate Problems
Two pipes can fill a tank in 30 minutes and 45 minutes respectively. If both pipes are opened at the same time, how long should pipe B be closed so that the tank is filled in 20 minutes?
Answer Choices
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5 minutes
B
7 minutes
C
10 minutes
D
11 minutes
E
12 minutes
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Explanation
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Difficulty
655-705
Type
PS
Category