Lizzy: Roberto and Valerie are jumping rope at recess. Roberto can skip 4,200 times an hour. Valerie can skip 80 times a minute. If they jump rope for fifteen minutes straight, how many skips will they total?.
Me: Hmmm, let me think. I think this is the detailed solution:
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Roberto skips 70 times per minute because 4,200 / 60 = 70. Together they skip 150 times a minute. They will skip 2,250 times because 150 x 15 = 2,250. Final answer: 2250.
Assistant