Unit 18 Section 1 : Speed In this section we introduce the idea
of speed, considering both instantaneous speed and average
speed. The speed at any particular time is called the
instantaneous speed. The following table lists units in common
use for speed and their abbreviations: Example QuestionsExample
Question 1 Judith drives from Plymouth to Southampton, a
distance of 160 miles, in 4 hours. She then drives from
Southampton to London, a distance of 90 miles, in 1 hour and 30
minutes. Determine her average speed for each journey. For the
Plymouth to Southampton journey, we divide 160 miles by 4 hours.
For the Southampton to London journey, we divide 90 miles by 1.5
hours. Example Question 2 (a) Calculate his average typing speed
in words per minute. (b) Calculate his average typing speed in
words per hour. Practice QuestionWork out the answer to these
questions then click on the button marked to see whether you are
correct. A marathon runner completed 24 miles in 4 hours.
ExercisesWork out the answers to the