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?
Roberto skips 70 times per minute because 4,200 / 60 = 
<gadget id="calculator">4200/60</gadget>
<output>70</output>
70.
Together they skip 150 times a minute.
They will skip 2,250 times because 150 x 15 = 
<gadget id="calculator">150*15</gadget>
<output>2_250</output>
2,250.

<result>2_250</result>