A water tank has M inlet pipes and N outlet pipes. An inlet pipe can fill the tank in 8 hours while an outlet pipe can empty the full tank in 12 hours. If all pipes are left open simultaneously, it takes 6 hours to fill the empty tank. What is the relationship between Mand N?

a. M:1=1:1
b. M:N=2:1
c. M:N=3:2
d. None of the above

• number of inlets should be greater than number of outlets so check by option,In any of the above options the m:n =2:1 than diffrence should be a multiple of 4 atleast so it is divisible by 6hours
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