ICSE Class 8 Answered
An express train of length 180m moving at 72km/h takes 45 seconds to cross a passenger train moving at 48km/h moving in the same direction . Find the length of the passenger train.
Asked by justjasonpong | 28 Dec, 2018, 10:08: AM
Expert Answer
Relative speed of express train with respect to passenger train = 72-48 = 24 km/hr = 24×(5/18) = 20/3 m/s
Hence distance travelled by express train in 45 seconds = Relative-speed × time = (20/3)×45 = 300 m
distance travelled by express train = ( length of passenger train ) + (length of express train ) = ( length of passenger train ) + 180 = 300 m
Hence length of passenger train = 120 m
Answered by Thiyagarajan K | 28 Dec, 2018, 01:54: PM
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