Two persons start from opposite ends and after crossing each other they complete the remaining journeys in $4$ hours and $16$ hours respectively. If the faster person’s speed is $18$ km/h, the slower person’s speed is:
Practice this question from Chapter Mock 8: Speed, Time and Distance, with options and an explanation.
Question
Two persons start from opposite ends and after crossing each other they complete the remaining journeys in $4$ hours and $16$ hours respectively. If the faster person’s speed is $18$ km/h, the slower person’s speed is:
Option A
6 km/h
Option B
8 km/h
Option C — Correct answer
9 km/h
Correct choice.
Option D
12 km/h
Explanation
When the post-meeting times are $4$ and $16$, the speed ratio is $\sqrt{16:4}=2:1$. So the slower speed is $9$ km/h.