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anonymous

  • 5 years ago

Andy's average driving speed for a 4 hour trip was 45 mph. During the first 3 hours he drove 40mph. What was his average speed?

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  1. anonymous
    • 5 years ago
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    This should be what was his average speed for the last hour of the trip.

  2. anonymous
    • 5 years ago
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    I know the direct answer to this question, but due to the honor code I can't really tell you. Remember that the average of anything is the sum of two numbers divided by how many numbers there are. For example, (4+5)/2 = 4.5, or midway between 4 and 5. In this example, you already know the average (45), 3 speeds, and you know that this happened over 4 intervals (how many numbers there are). You only need to figure out which number you're missing, and then solve for it.

  3. anonymous
    • 5 years ago
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    In the example you gave me, you already know the average*

  4. anonymous
    • 5 years ago
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    [(40+40+40+x)/4]=45 The last hour was 60mph.

  5. anonymous
    • 5 years ago
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    could you multiply the hours 4 and 3 with the difference from 45 to 40 to get the answer 60? or is that just coincidence? so, (Vf-Vi)(12)

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