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31 March, 08:12

Nina can ride her bike 63,360 feet in 3,400 seconds, and Sophia can ride her bike 10 miles in 1 hour. What is Nina's rate in miles per hour if there are 5,280 feet in a mile?

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  1. 31 March, 12:06
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    5,280 feet → 1 mile

    63,360 feet → 63,360/5,280 = 12 miles

    60 x 60 seconds → 1 hour

    3,400 seconds → 3,400/3,600 = 17/18 hours

    Nina's rate = 12 miles / (17/18) hours = 12 12/17 miles per hour.
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