Two cars A and B start simultaneously from points X and Y towards each other. After meeting, car A takes 4 hours to reach Y and car B takes 9 hours to reach X. If the speed of car A is 60 km/h, what is the speed of car B?
Answer and explanation
Correct answer: D. 40 km/h
- Step 1: Use standard formula for post-meeting times: Speed_A / Speed_B = sqrt(Time_B / Time_A).
- Step 2: 60 / Speed_B = sqrt(9 / 4) = 3 / 2.
- Step 3: Speed_B = 60 * (2 / 3) = 40 km/h.
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