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Dafna1 [17]
3 years ago
8

If you are six feet tall how far back from a 3 foot mirror do you have to stand in order to see yourself completely?

Physics
1 answer:
OverLord2011 [107]3 years ago
7 0

Answer:

you would have to stand 6 ft back

Explanation:

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A general contractor drives 5 miles to the hardware store in 10 minutes. He shops for needed tools for 30 minutes, then drives t
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Given parameters:

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Solution:

 Average speed is the total distance covered divided by the total time taken.

   Average speed = \frac{total distance}{total time taken}  

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We do not know the distance to customer's home but we have been given the speed and time, so we can find the distance.

  Distance  = speed x time

 Convert the time to hrs and solve;  

                       60 minutes  = 1 hr

                       20 minutes  = \frac{20}{60} hr  = \frac{1}{3} hr

So, Distance  = 45mph x \frac{1}{3} hr   = 15miles

Now;

   Total distance  = 5 + 15 = 20miles

Total time = time to reach hardware shop + time to reach customer's house

                  = 10 + 20

                  = 30 minutes

Convert the time from minutes to hrs;

                 60 minutes  = 1hr

                 30 minutes  = \frac{30}{60}   = 0.5hr

So;

    Average speed  = \frac{20}{0.5} = 40mph

The average speed is 40mph

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