Two identical taps fill 2/5 of a tank in 20 minutes.when one of the taps goes dry n how many minutes will the remaining one tap fill the rest of the tank?

A 5 min
B 10 min
C 60 min
D 20 min

Correct Answer: 60 min

2 taps can fill in 20 minutes = 2/5th 1 tap can fill in 20 minutes = 1/5th. remaining portion to be filled up = 1 - 2/5 = 3/5. 1/5th can be filled by 1 tap in 20 mins 3/5th can be filled by 1 tap in 20x3 mins = 60 minutes. (ans)
Bissoy MCQ
#গণিত #নল ও চৌবাচ্চা (Pipes and cistern) #Jamuna Bank Ltd #Jamuna Bank Ltd - Probationary Officer - 2009

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