Which group of 3 cards would allow Carlos to win with 21 points?
1 answer:
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The answer is going to be C(t)= 150
If you solve d = rt for t, you have t = d/r. If we have values for d and r we will fill them into that equation and divide. 
. Setting that up so the meters cancel as they should looks like this: 
lets us divide as we need to and at the same time cancel out the distance, leaving us time in hours. The t value then is 11.3 hours.