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Since, it takes 30 minutes extra to fill tank due to leakage, therefore:-
total time taken to fill tank along with leakage= 4+1/2 hrs = 9/2 hrs
Hence, 1/A + 1/B - 1/C = 1/9/2 (Here, C represents the leakage)
Thus, 1/9/2 becomes 2/9
Since, it takes 30 minutes extra to fill tank due to leakage, therefore:-
total time taken to fill tank along with leakage= 4+1/2 hrs = 9/2 hrs
Hence, 1/A + 1/B - 1/C = 1/9/2 (Here, C represents the leakage)
Thus, 1/9/2 becomes 2/9
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2/9 how?