Question

Two pipes A and B can separately fill a tank in 36 minutes and 45 minutes respectively. If both the pipes are opened simultaneously, how much time will it take to fill the tank.

Answer 1

Step-by-step explanation:

In 1 min pipe A can fill 1/36 of tank

In 1 min pipe B can fill 1/45 of tank

If both of them are left open simultaneously then total tank filled in 1 min=1/36+1/45=1/20

Therefore total time required to fill the tank=1/(1/20)=20minutes

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Answer 2

Answer:

Step-by-step explanation:

In 1 minute pipe A can fill 1/36 of tank

In 1 minute pipe B can fill 1/45 of tank

If both of them are left open

Simultaneously, then total tank filled in 1 minute =1/36+1/45 = 1/20

Therefore, total time required to fill the tank= 1/(1/20)=20 minutes.

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