Civil Services Examination · Question 20
The speed of a train T is 100 km per hour and the speed of a person P is 4 km per hour. T crosses P in 15 seconds if P travels along the direction of motion of T. If P travels along the opposite direction of T, then in how much time does T cross P, in seconds, approximately?
Show answer & explanation
Answer: (C) 13.85
Explanation
Train length = (96 × 5/18) × 15 = 400 m. Opposite direction: 104 km/h = 28.89 m/s, so time = 400/28.89 ≈ 13.85 s.