A) 2 : 3
B) 3 : 4
C) 4 : 5
D) 5 : 6
Correct Answer: B
Solution :
\[\because \] Speed of train is constant, then \[\frac{{{S}_{1}}}{{{T}_{1}}}=\frac{{{S}_{2}}}{{{T}_{2}}}\] \[\therefore \] \[\frac{240}{{{T}_{1}}}=\frac{240+80}{{{T}_{2}}}\] \[\Rightarrow \] \[\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{240}{320}\] \[\Rightarrow \] \[{{T}_{1}}:{{T}_{2}}=3:4\]
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