A) 2.5 s
B) 5 s
C) 12.5 s
D) \[3\frac{5}{4}\,\,\text{s}\]
Correct Answer: A
Solution :
Speed of the train\[=144\,\,\text{km/h}=144\times \frac{5}{18}=40\,\,\text{m/s}\] When a train crosses a pole, it covers a distance equal to its own length. \[\therefore \]The required time \[=\frac{100}{40}=\frac{5}{2}=2.5\,\,\text{s}\]You need to login to perform this action.
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