exam Maths Puzzle Numerical Ability

p (girl,boy,girl) WITHOUT REPLACEMENT
P (boy,girl) WITHOUT REPLACEMENT
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p (Boy,girl) WITH REPLACEMENT
P (girl,girl,girl) WITH REPLACEMENT

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Mark reads at an average rate of 30 pages per hour, while Mindy reads at an average rate of 40 pages per hour. If Mark starts reading a novel at 4:30 pm, and Mindy begins reading the same novel at 5:20 pm, at what time will they be reading the same page? what is the difference in commutative property and associatative property?