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Aakruthi and Prakruthi are playing skipp...

Aakruthi and Prakruthi are playing skipping-rope. Aakruthi skips 30 times in a minute and Prakruthi skips 20 times in a minute. Both of them start skiping at 4.50 p.m. and continue till 5 p.m. without any interruption. How many times do they skip the rope simultaneously after 4.50 p.m. ?

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