Time, Speed & Distance · Question 12 · Hard
Time, Speed & Distance question 12
Two trains start at the same time from stations X and Y towards each other. After meeting, they take 9 hours and 4 hours respectively to reach Y and X. What is the ratio of the speed of the train from X to that of the train from Y?
- 9 : 4
- 4 : 9
- 3 : 2
- 2 : 3
Answer and explanation
Answer: D. 2 : 3
Explanation: If they meet after t hours, the X-train then covers the Y-train's distance: (S_Y × t)/S_X = 9 and (S_X × t)/S_Y = 4. Dividing, (S_X/S_Y)² = 4/9, so S_X : S_Y = 2 : 3.
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