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Which quantity moves, and which way?

Exercise and reference answers

Items
  1. Item
    Time, when speed rises on a fixed route
    Category
    Goes down
  2. Item
    Time, when the route gets longer at fixed speed
    Category
    Goes up
  3. Item
    Distance, when time rises at fixed speed
    Category
    Goes up
  4. Item
    Distance, when only the speed changes on one route
    Category
    Unchanged
Categories
  1. Item
    Goes up
  2. Item
    Goes down
  3. Item
    Unchanged

Explanation

Fixing one of the three decides the behaviour of the other two. Source: syllabus Maths, Ch 11 Direct and Inverse Proportions.
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