A pump can fill a tank in 10 hours. But it takes 18 hours to fill a tank due to leakage. In how many hours leakage will empty the tank 

1
\(22 { 1 \over 2} hours\)
2
\(26 { 1 \over 2 }hours\)
3
\(32 { 1 \over 2 } hours\)
4
\(24 {1 \over 2 } hours\)

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