Two trains, 250 metres and 150 metres long respectively, are running on parallel lines. If they are running in the same directions, the faster train crosses the slower train in 40 seconds. If they are moving in the opposite direction they pass each other in eight seconds. What is the speed of the slower train?
12 sec
8 sec
108 seconds
252 seconds
Explanation:
Relative speed = (45 - 40) km/hr = 5 km/hr
= (5×5/18)m/sec
= 25/18 m/sec
Total distance covered = Sum of lengths of trains = (200 + 150) m = 350 m
∴ Time taken= (350×18/25)sec
= 252 seconds
Relative speed = (45 - 40) km/hr = 5 km/hr
= (5×5/18)m/sec
= 25/18 m/sec
Total distance covered = Sum of lengths of trains = (200 + 150) m = 350 m
∴ Time taken= (350×18/25)sec
= 252 seconds