A) 1s
B) 2s
C) 3s
D) Zero
Correct Answer: B
Solution :
\[\text{Time=}\frac{\text{total length}}{\text{relative velocity}}\text{=}\frac{\text{X+X}}{\text{20+20}}\frac{\text{2X}}{\text{40}}\text{s}\] \[=\text{ }2s\]
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