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Which pair varies which way?

Exercise and reference answers

Items
  1. Item
    Distance and time, at a fixed speed
    Category
    Direct
  2. Item
    Longer journey, longer time
    Category
    Direct
  3. Item
    Speed and time, over a fixed distance
    Category
    Inverse
  4. Item
    Faster car, shorter journey time
    Category
    Inverse
Categories
  1. Item
    Direct
  2. Item
    Inverse

Explanation

Fix the distance and speed fights time fix the speed and distance follows time. Source: syllabus Maths, Ch 11 Direct and Inverse Proportions.
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