The time taken for a committee meeting is partly constant and partly varies as the square of the number of members present. If there are fifteen members present, the meeting lasts only 45 minutes, but with twenty-five it takes exactly 2hrs 15 minutes. How long will it last if there are thirty members there?

A. 3hrs
B. 3hrs 17 mins  
C. 2 hrs \(19 \mathrm{mins}\)
D. \(1 \mathrm{hr} 18 \mathrm{mins}\)

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Correct Answer: B