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How to Compute Average Speed
1. 
Write a fraction using the Total Distance to touchdown point as
the numerator and the Flight Time as the denominator. 
2. 
Average speed is written as a unit rate. To find the unit rate,
divide the denominator in to the numerator. If necessary, round
the decimal to the nearest hundredths place. Label your answer with
inches/second) 
3. 
Ask the mission specialist to write this number on the Landing Data
Collection Sheet. 
Example:
If the Total Distance to touchdown point is 90 inches, and the Flight
Time is 8 seconds, the fraction would be 90/8.
1. 
Find the average speed by dividing the denominator in to the numerator:
If you are using a calculator, type the numerator number first:
90
symbol
8
= symbol
The average speed is 11.25 in/sec.

Practice finding the average speed using the following fractions:
Answer Key
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