Average Speed Calculation for Mixed Speeds

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To calculate the average speed for a trip involving mixed speeds, the total distance traveled is 53.25 miles, derived from traveling 33 miles at 66 mph for 30 minutes and 20.25 miles at 27 mph for 45 minutes, with a 20-minute lunch break. The total travel time is 95 minutes, which converts to 1.58 hours when divided by 60. The average speed is then calculated by dividing the total distance by the total time, resulting in an average speed of approximately 33.64 miles per hour. The calculation highlights the importance of ensuring time is expressed in hours for accurate average speed determination. This method effectively demonstrates how to compute average speed for trips with varying speeds and stops.
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Homework Statement



A person travels at a constant speed of 66 miles per hour for 30 minutes, 27 miles per hour for 45 minutes, and stops for lunch for 20 minutes. Calculate the average speed for the entire trip (in miles per hour).


Homework Equations


N/A


The Attempt at a Solution


66mph for 30mins= 33miles, 27mph for 4min= 20.25miles, and 0mph for 20min= 0miles

33+20.25+0= 53.25miles

What do I do after I have found this information?
 
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Find the total travel time and divide.
 
95min/53.25= 1.78mph... that seems to slow
 
What units was the time in the denominator expressed in?
 
divide 95 by 60 to get the answer in hours...

53.25miles/1.58hrs= 33.64mph
 

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