Pipes A and B can fill a tank in 18 minutes and 12 minutes respectively. If both the pipes are opened simultaneously, how long will they take to fill the tank?
A
30 minutes
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B
20 minutes
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C
10 minutes
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D
715 minutes
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Solution
The correct option is C715 minutes
Let ′V′ be total volume of tank
Time taken by A to fill tank =18min
Speed of A=V18
Time taken by B to fill tank =12min
Speed of B=V12
∴ Total time taken by A and B to fill tank when opened