Two trains, 130 meters and 120 meters long, are running in parallel tracks in the same direction at speeds of 62 km/hr and 44 km/hr, respectively. How much time will the faster train take to completely cross the slower one?
50 seconds
Relative speed (same direction): \(62-44 = 18\) km/h \(= 18\times\tfrac{5}{18} = 5\) m/s.
Combined length of both trains: \(130+120 = 250\) m.
Time to cross: \(\dfrac{250}{5} = 50\) seconds.
Hence, the faster train takes 50 seconds to completely cross the slower one.
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