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Mathematics
Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in_________?
A
6 hours
Option A
B
6 2/3 hours
Option B
7 hours
Correct answer
D
7 1/2 hours
Option D
Correct answer: C
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