Two pipes A and B can fill a drum in 36 hrs and 45 hrs respectively. If both the pipes start at the same time, how long will it take to fill the tank?

40 hrs

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50 hrs

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60 hrs

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20 hrs

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35 hrs

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Solution

The correct option is D
20 hrs

Part filled by A in an hour = $\frac{1}{36}$

Part filled by B in an hour = $\frac{1}{45}$

Part filled by (A+B) in an hour = $(\frac{1}{36} + \frac{1}{45}) = \frac{1}{20}$ .

Hence, both the pipes together will take 20 hours to fill the drum.

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Two pipes A and B can fill a drum in 36 hrs and 45 hrs respectively. If both the pipes start at the same time, how long will it take to fill the tank?

The correct option is D 20 hrs Part filled by A in an hour = 136 Part filled by B in an hour = 145 Part filled by (A+B) in an hour = (136+145)=120. Hence, both the pipes together will take 20 hours to fill the drum.

The correct option is D
20 hrs

Part filled by A in an hour = $\frac{1}{36}$

Part filled by B in an hour = $\frac{1}{45}$

Part filled by (A+B) in an hour = $(\frac{1}{36} + \frac{1}{45}) = \frac{1}{20}$ .

Hence, both the pipes together will take 20 hours to fill the drum.