Transitive race advantage: In a 200 m race, A beats B by 50 m and B beats C by 8 m. By how much does A beat C in 200 m?
Aptitude
Races and Games
Difficulty: Medium
Choose an option
-
A60 m
-
B72 m
-
C56 m
-
D66 m
Answer
Correct Answer: 56 m
Explanation
Introduction / Context:Infer speed ratios from two pairwise results and combine to compare A and C directly.
Given Data / Assumptions:
- A:B in 200 m ⇒ 200:150 = 4:3
- B:C in 200 m ⇒ 200:192 = 25:24
Concept / Approach:Multiply ratios for A:C, then scale to 200 m to find C’s distance at A’s finish.
Step-by-Step Solution:
A:C = (4/3)*(25/24) = 100/72 = 25/18If A runs 200, C runs 200*(18/25) = 144Lead = 200 − 144 = 56 mVerification / Alternative check:Cross-check by finding C’s speed as a fraction of A’s from chained ratios.
Why Other Options Are Wrong:They don’t reflect the chained ratio 25:18 scaled to 200 m.
Common Pitfalls:Subtracting the leads (50 and 8) instead of combining ratios.
Final Answer:56 m