To find the average speed, you would divide the total distance traveled by the total time taken. In this case, 128 inches in 16 hours would be 8 inches per hour. So, the average speed is 8 inches per hour.
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143+98+128=369369/3=123
The density is 128 and an eighth grams per cubic inch.
128
5o miles per hour is 73.3 feet per second. The average stopping distance for the breaks at that speed is 128 feet. Now add to that the average reaction time for a driver at that speed which is 3/4 second so we add 55 feet gives us a total of 183 feet.
Well, if you drove for 60 minutes (one hour) at that speed, you would travel 128 miles. But you only traveled for 15 minutes- one fourth of an hour. Divide 128 by 4, and that is your answer.