A) zero
B) \[1m{{s}^{-1}},1m{{s}^{-1}}\]
C) \[1m{{s}^{-1}},2m{{s}^{-1}}\]
D) \[2m{{s}^{-1}},1m{{s}^{-1}}\]
Correct Answer: A
Solution :
[a] Initial speed of trains A and B is zero as both trains start from rest.
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