Question

The Indianapolis 500 is one of the most exciting events in sports. Each spring, 33 drivers compete in the 500-mile race, sometimes hitting speeds of more than 220 miles an hour. The general formula for computing distance is rate (or speed) multiplied by time, given a steady average speed. The formula may be written d = rt. Answer today's project questions on speed, distance, and time.

The driver's average speed to complete all 8 laps is ______ miles per hour. Round to the nearest tenth of a mile per hour.

Answer 1

please help me

Answer 2

1. d = r*t

If the race is 8 laps and the total miles is 500, that means that each lap represents 62.5 miles.

If the driver does the first 3 laps at 185 miles per hour, we use d = r*t.
Each lap is symbolized by d = 62.5 miles.
Using the formula, we now have the equation below to find to do the first 3 laps.

3*d/(185)

Do the same thing for the next part:

5*d/(200)

Add them together and you get t.

The answer is 3d/185 + 5d/200 = t

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2. We need to use percentages here.

The percent the driver drove 185 miles per hour is 3/8.
The percent the driver drove 200 miles per hour is 5/8.

185 * (3/8) + 200*(5/8) = 69.375 + 125 = 194.375 mph

To the nearest tenth: 194.4 mph

Answer 3

This is where Ryan got it I will see if it is correct answer :)

http://answers.yahoo.com/question/index?qid=20111018095803AAf0gKU

Answer 4

thank you!!! is it right?

Answer 5

yep it is!

Answer 6

thank you!!!

Answer 7

yw! :)

Answer 8

Bar is this right?