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21 December, 13:27

You are biking at a speed of 18 miles per hour. You are 3 miles behind your friend, who is biking at a speed of 12 miles per hour. Write and solve an equation to find the amount of time it takes for you to catch up to your friend.

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  1. 21 December, 16:44
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    A. solve by logic:

    You bike 18 miles per hour, and your friend, 12 miles per hour.

    In one hour, you'd catch up 6 miles, so in half-an-hour you'd catch up 3 miles.

    B. Solve by equations:

    Let x=time needed in hours

    18x-12x=3

    6x=3

    x=3/6=0.5 hours
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