a) 2 : 1
b) 3 : 2
c) 4 : 3
d) 5 : 4
Answer: b
Explanation: A →____________________← B
Ratio of the speed of trains is given by;
$$\eqalign{
& \frac{{{\text{Speed}}\,{\text{of}}\,{\text{train}}\,A}}{{{\text{Speed}}\,{\text{train}}\,{\text{of}}\,B}} = \frac{{\sqrt B }}{{\sqrt A }} \cr
& = \frac{{\sqrt 9 }}{{\sqrt 4 }} \cr
& = \frac{3}{2} \cr
& = 3:2 \cr} $$
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