Pipe A alone fills a tank in 5 hours and pipe B alone in 8 hours. If both are opened together on the empty tank, in how much time will it be three-quarters full?
Competition practicePipes & Cisterns
A2134h
B3131h
C4.875 h
D2 h
Step-by-Step Solution
Together 51+81=4013 per hour. 43÷4013=1330=2134 h.(3131 h fills the whole tank.)
Answer: A) 2134h
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