A tap can fill a tank in 6 hours. After half the tank is filled , three more similar taps are opened . What is the total time taken to fill the tank completely?

A tap can fill a tank in 6 hours. After half the tank is filled , three more similar taps are opened . What is the total time taken to fill the tank completely? Correct Answer 3 hrs 45 min

1 tap full = 6 hurs 1 tap half = 3 hrs 4 tap half = 3/4 hrs = 45 min ∴ Total = 3 hrs 45 min
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