Q: A tank has two pipes. Pipe M is to fill the tank and pipe N is to empty the tank. If pipe M takes 45 hours to fill the tank completely and N takes 90 hours to empty the tank completely. Then how much time will it take to fill the half empty tank?
A.
45 hours
B.
35 hours
C.
60 hours
D.
40 hours
Correct Answer:
Option A -
Explanations:
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