Two pipes ­ A and B, together fill a water tank in 4 hours. If they are used separately, then pipe A will take 6 hours more than pipe B to fill the tank. How much time will pipe A alone take to fill the water tank?

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KPTCL Assistant Exam (Mescom) SLOT-1 7-MAY­-2017 click here to view all questions

Two pipes ­ A and B, together fill a water tank in 4 hours. If they are used separately, then pipe A will take 6 hours more than pipe B to fill the tank. How much time will pipe A alone take to fill the water tank?

A6 hours

B12 hours

C8 hours

D10 hours

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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-

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

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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