A train passes a tunnel 200 m long in 20 seconds. Speed is 72 km/h. Find train's length.
Show answer & explanation
Correct answer: B
Explanation
Given:
Tunnel length = 200 m
Time = 20 s
Speed = 72 km/h
Formula:
Speed = Distance / Time
72 km/h = 72 × 5/18 = 20 m/s
Total distance = Speed × Time = 20 × 20 = 400 m
Length of train = 400 − 200 = 200 m