A tank has 4 taps at its top end. Every tap can fill the tank in 16 hours when left open one at a time. A small pipe at the bottom empties the tank in 8 hours. Find the number of hours it would take for the tank to fill if all 4 taps at top and the pipe at bottom are left open together
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two thanks fill in 8 hour
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two thanks fill in 8 hour
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