Distance between A and B is 820 km. Two persons A and B having speed 40 km/h and 90 km/h start to meet each other. P starts off at 8 o'clock and Q starts off at 9 o'clock. At what time will they meet?

a) 11:00 AM
b) 11:30 AM
c) 12:00 PM
d) 12:30 PM

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