Two pipes can fill a tank in 20 minutes will 30 minutes respectively. If both the pipes are opened simultaneously, then the tank will be filled in-

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Two pipes can fill a tank in 20 minutes will 30 minutes respectively. If both the pipes are opened simultaneously, then the tank will be filled in-

A10 minutes

B12 minutes

C15 minutes

D25 minutes

rashmi ? Jan 8 '2020 at 13:33

Correct answer is:12 minutes

Explanation:

In this type of questions we first get the filling in 1 minute for both pipes then we will add them to get the result, as

Part filled by A in 1 min = \(\frac{1}{20}\)
Part filled by B in 1 min = \(\frac{1}{30}\)

Part filled by (A+B) in 1 min = \(\frac{1}{20} + \frac{1}{30}\)
\(= \frac{1}{12}\)

So both pipes can fill the tank in 12 mins.

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Correct answer is:12 minutes Explanation: In this type of questions we first get the filling in 1 minute for both pipes then we will add them to get the result, as Part filled by A in 1 min = \(\frac{1}{20}\) Part filled by B in 1 min = \(\frac{1}{30}\) Part filled by (A+B) in 1 min = \(\frac{1}{20} + \frac{1}{30}\) \(= \frac{1}{12}\) So both pipes can fill the tank in 12 mins. rashmi ? answered Jan 8 '2020 at 13:33 All Comments

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