A) 46.5 km/h
B) 37.5 km/h
C) 37.6 km/h
D) 39.6 km/h
Correct Answer: D
Solution :
[d] Let the length of the train = x m \[\therefore \] \[\frac{x+122}{17}=\frac{x+210}{25}\] \[\Rightarrow \] \[25x+3050=17x+3570\] \[\Rightarrow \] \[8x=520\] \[\Rightarrow \] \[x=65\] Hence, speed of train \[=\frac{65+122}{{}}17=\frac{187}{17}\] \[=\frac{11\times 18}{5}=39.6\,km/h\] |
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