Two trains Mumbai Rajdhani and Kissan Express of lengths 850 m and 700 m respectively are 1050 m apart and are running on parallel tracks towards each other. Mumbai Rajdhani is running at 62 km/h and Kissan Express is running at 55 km/h. In how much time (in sec) will the trains cross each other?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 80 sec
Length of Mumbai Rajdhani = 850 m
Length of Kissan Express = 700 m
Speed of Mumbai Rajdhani = 62 km/h
Speed of Kissan Express = 55 km/h
Distance between two trains = 1050 m
Relative speed of two trains running in opposite direction = (Speed of first train + Speed of second train)
Time =
According to the question
The relative speed of trains = (Speed of Mumbai Rajdhani) + (Speed of Kissan Express)
⇒ 62 + 55 = 117 km/h
⇒117 × = m/s
Total distance travelled by trains during crossing each other (850 + 700 +1050) = 2600 m
Hence, the time to cross the trains each other is given by
⇒ = 80 sec