A tap can fill a tank in 8 hours. After half the tank is filled, four more similar taps are
opened. What is the total time taken to fill the tank completely?
A3 hours, 30 min
B4 hours, 40 min
C5 hours, 30 min
D4 hours, 48 min
A3 hours, 30 min
B4 hours, 40 min
C5 hours, 30 min
D4 hours, 48 min
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