A train traveling at 36km/h completely passes another train half its length in 12 seconds traveling in opposite direction at 54 km/h. If it also passes a platform in 1.5 min, what is the length of platform?
Q1. A train traveling at 36km/h completely passes another train half its length in 12 seconds traveling in opposite direction at 54 km/h. If it also passes a platform in 1.5 min, what is the length of platform?
Answer: 700 m
Explanation: Combined speed = 36 + 54 = 90 km/h = 25 m/s; train A length = 25 × 12 − (train B length = half of A) gives train A = 200 m; passing platform in 90 s at 10 m/s: platform = 90×10 − 200 = 700 m.