Aptitude Test for Software Developers

Q.  Tap P alone fills a cistern in 2 hours; while tap Q alone fills the same cistern in 3 hours. A new tap R is attached to the bottom of the cistern which can empty the completely filled cistern in 6 hours. Sunny started all three taps together at 9am. When will the tank be full?

a. 10.30 am
b. 11.15 am
c. 12 pm
d. 9.45 am

ANSWER: See Answer

No explanation is available for this question!
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