CBSE Class 8 Answered
A train 450m long passes another train coming from opposite direction on parallel tracks in 30 seconds . If their speeds are 43km/hrs and 47km/hrs respectively, find the length of another train.
Asked by Sy2349292 | 20 Jan, 2019, 06:53: PM
Expert Answer
Let L be the unknown length of another train (in metre).
To cross one another each tarin has to travel the distance (450+L)m
since the trains are moving in opposite direction, relative speed of each train = (43+47) km/hr = 90 km/hr = 90×(5/18) m/s = 25 m/s
distance / (relative speed ) = time
(450+L)/25 = 30 or (450+L) = 750 m or L = 300 m
Length of another train = 300 m
Answered by Thiyagarajan K | 20 Jan, 2019, 08:08: PM
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