Two cars get closer by 9 m every second while travelling in opposite directions. They get closer by 1 m every second while travelling in the same direction. What are their speeds?
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Question

Two cars get closer by 9 m every second while travelling in opposite directions. They get closer by 1 m every second while travelling in the same direction. What are their speeds?

G1 Physics · Accepted Answer

Let speeds be v₁>v₂. Opposite directions: v₁+v₂=9. Same direction: v₁-v₂=1. Solving gives v₁=5 and v₂=4 m s⁻¹. Option A.