arithmetic - two trains each 100 m long are moving in opposite directions they cross each other in 8 seconds if one is moving twice as fast the other the speed of the faster train is - skillgun

Total distance covered = 100+100 = 200 m
Time = 8 s
let speed of slower train is v . Then the speed of the faster train is 2v
(Since one is moving twice as fast the other)
Relative speed = v + 2v = 3v
3v = 200/8 m/s = 25 m/s
=> v = 25/3 m/s
Speed of the faster train = 2v = 50/3 m/s = (50/3)×(36/10) km/hr = 5×36/3 = 5×12 = 60 km/hr