Question

A train covers a distance of $12$ km in $10$ minutes. If it takes $6$ seconds to pass a telegraph post, then what is the length of the train?

• A. $120$ m
• B. $50$ m
  
• C. $130$ m
  
• D. $70$ m
  

Answer 1

The correct option is A $120$ m

Speed of the train $=\frac{12\times 1000}{10\times 60}m/sec=20m/sec.$
Length of the train $=$ Speed of the train $\times$ Time taken by the train to pass a telegraph post $=(20\times 6)m=120m$