Question

Pipe A alone takes 30 minutes to fill a cistern. Pipe A was turned off after working for 10 minutes. The rest of the cistern is filled by pipe B in 40 minutes. How much time in minutes does pipe B take to fill the cistern alone in hours?
1
60
3600
2

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

the correct ans is: 1

Step-by-step explanation:

Time taken by the pipe A to fill the cistern = 30 minutes = 0.5 hours

Fraction of the cistern filled in one minute = 1/30

Fraction of cistern filled in 10 minutes = (1/30)×10 = 1/3

Fraction of cistern yet to be filled = 1-1/3 = 2/3

2/3 of cistern is filled by pipe B in 40 minutes. Time taken to fill a complete cistern is 1/ (2/3) ×40 = 60 minutes = 1 hour