Pipe A can fill a cistern in 5 hours and pipe B in 10 hours. Both the pipes are opened together and after 2 hours pipe A is closed, how much time will the pipe B take to fill up the remaining part of a tank?
Answers
Step-by-step explanation:
Let "60 units" represent the total water needed for the cistern to fill.
1) Find how many units can pipe A fill for an hour.
60 units / 5 hours = 12 units
Pipe A can fill 12 units for 1 hour.
2) Find how many units can pipe B fill for an hour.
60 units / 10 hours = 6 units
Pipe B can fill 6 units for 1 hour.
3) Find how many units did Pipe A fill for 2 hours after it closed.
12 units x 2 hours = 24 units
Pipe A fills 24 units in 2 hours before it closed.
4) Find how long will it take for pipe B to fill the remaining.
60 units - 24 units = 36 units
Pipe B needs to fill 36 units in the cistern to fill it up.
36 units / 6 units = 6 hours
Answer:
It will take 6 hours for pipe B to fill the remaining part of a tank.
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