A train traveling at a constant speed enters a 200-meter tunnel. It takes 10 seconds for the entire train to pass through the tunnel. If the train is 100 meters long, what is the speed of the train in meters per second?
Show answer & explanation
Correct answer: C
Explanation
Tunnel length = 200 meters
Train length = 100 meters
Time to cross the tunnel = 10 seconds
When the train crosses the entire tunnel, it has to travel a distance equal to its own length + the tunnel length.
Total distance
200 + 100 = 300 meters
Formula of speed = Distance/ Time
= 300/10 m/s
= 30 m/s