No.133 Train, Bridge and Tunnel
Example
A train takes 20 seconds to completely cross a 300 m bridge and 32 seconds to completely pass through a 660 m tunnel. Find the train length and speed.
POINT
When a train passes completely, distance traveled = train length + bridge or tunnel length.
Train length: 300 m / Speed: 108 km/h
Practice
Practice 1
A train completely passes a 240 m bridge in 18 seconds and a 480 m tunnel in 30 seconds. Find its length and speed in km/h.
Length: 120 m / Speed: 72 km/h
Practice 2
A train completely passes a 200 m bridge in 15 seconds and a 500 m tunnel in 25 seconds. Find its length and speed in km/h.
Length: 250 m / Speed: 108 km/h