Worked Example 4: Speed and Time
Part of Proportion · GCSE GCSE Mathematics revision
This study notes covers Worked Example 4: Speed and Time within Proportion for GCSE Mathematics. Revise Proportion in Number for GCSE Mathematics with 12 exam-style questions and 22 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 10 of 16 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 16
Practice
12 questions
Recall
22 flashcards
Worked Example 4: Speed and Time
For a journey of fixed distance, time is inversely proportional to speed. At 60 mph, the journey takes 2 hours. How long at 40 mph?
Solution
T ∝ 1/S, so T = k/S
When S = 60, T = 2: 2 = k/60
k = 2 × 60 = 120
So T = 120/S
When S = 40: T = 120/40 = 3
Answer: 3 hours
Keep building this topic
Read this section alongside the surrounding pages in Proportion. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Proportion
y is directly proportional to x. Which equation could represent this relationship?
Explain how you can tell from a graph whether two quantities are in direct or inverse proportion.
Quick Recall Flashcards
12 questions on Proportion — practise free
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