A) 24 km/h
B) 26 km/h
C) 40km/h
D) 45 km/h
Correct Answer: D
Solution :
Let length of train \[=x\,m\] \[\therefore \] Speed of train \[=\frac{x}{10}\] ?(i) and \[\frac{(50+x)10}{x}=14\] \[\Rightarrow \] \[500+10x=14x\] \[\Rightarrow \] \[4x=500\] \[\Rightarrow \] \[x=125\,m\] \[\therefore \] Speed of train\[=\frac{125}{10}=12.5\,m/s\] \[=\frac{12.5\times 18}{5}=45\,\text{km/h}\]You need to login to perform this action.
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