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A train is 360 meter long is running at a speed of 45 km/hour. In what time will it pass a bridge of 140 meter length?

  • A.20 sec
  • B.30 sec
  • C.40 sec
  • D.50 sec

Answer: C

\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]

\[ 45 \text{ km/hr} = 12.5 \text{ m/s} \]

\[ t = \frac{360 + 140}{12.5} = \frac{500}{12.5} = 40 \text{ seconds} \]

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