Question

200 mL of water is poured in a 1 L container every minute, and 100 mL water is drawn out after each minute. If the container was empty originally, minimum how much time (in min) will it take to fill the container?

• A. 10
• B. 8
• C. 9
• D. 11

Answer 1

The correct option is C 9

Amount of water poured into the container each minute = 200 mL
Amount of water drawn out from the container after each minute = 100 mL
Amount of water in the container after 1 min = 200 - 100
= 100 mL
So, the amount of water in the container after 8 min = 800 mL
Now, as soon as next 200 mL water is poured in the container it will be filled.
So, the minimum amount of time that it will take to fill up the container = 8 + 1
= 9 min.