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- Two pipes A and B can fill a tank in 20 and 30 minutes respectively.
Question 1:
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long it will take to fill the tank? A. 10 mins
B. 12 mins
Feedback 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 = 1/20
Part filled by B in 1 min = 1/30
Part filled by (A+B) in 1 min = 1/20 + 1/30= 1/12
So both pipes can fill the tank in 12 mins.
Part filled by A in 1 min = 1/20
Part filled by B in 1 min = 1/30
Part filled by (A+B) in 1 min = 1/20 + 1/30= 1/12
So both pipes can fill the tank in 12 mins.
C. 15 mins
D. 20 mins
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