Pipe A can fill an empty tank in 9 hour while pipe B can empty the full tank in 10 hours.If both are opened in the empty tank,how much time will they take to fill it up completely?
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4
Answer:
19
Step-by-step explanation:
Time taken by pipe A = 9hr
Time taken by pipe B = 10 hr
total time taken = 9+10=19 hr
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