please answer this question
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Answer:
18.5 minutes
Step-by-step explanation:
1/7= tank filled by tap of 7 minutes in one minute
1/9=" " " " " "" 9 minutes " " "
1/9+1/7= tank filled by both
1/5= water discharged in one minute
time taken to be filled in one minute= 1/7+1/9-1/5
=17/315
time take to fill the whole tank=315/17
= 18.52 or 18.5
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