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A train is 125 m long. If the train takes 30 sec to cross a tree by the railway line, then the speed of the train is :
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Speed : }} \cr
& = {\text{ }}\frac{D}{T} \cr
& = \frac{{125}}{{30}}{\text{m /sec}} \cr
& {\text{ = }}\frac{{125}}{{30}} \times \frac{{18}}{5}{\text{ km /hr}} \cr
& {\text{ = 15 km /hr}} \cr} $$
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