火车过桥（Viaduct Designer）.doc

火车过桥（Viaduct Designer） The train bridge is a kind of travel problems, also the relationship between the number of distance, speed and time, but also relates to the problem of commander, long bridge etc.. The basic relationship between the number of train speed * time = length + Long Bridge [sample analysis] Example 1 a train is 150 meters long and 19 meters per second. How long does it take to get the whole car through the 800 meter long bridge? Analysis of the train bridge, from the front of the bridge to the end of the bridge from the bridge. The tail of the car after the long distance = + long bridge, the tail of the car driving for the journey time by car with a long long bridge and divided by the speed. Solution: (800+150) / 19=50 (seconds) Answer: whole car passes 800 meters long bridge, need 50 seconds. Learn at [] A train 200 meters long, it at 10 meters per second speed through 200 meters long tunnel, from the front into the tunnel, to the end of the tunnel, how many seconds? Example 2. A train 200 meters long, at a speed of 8 meters per second through a tunnel, from the front into the hole to the end of the car, leaving the hole, spent a total of 40 seconds. How many meters is the length of the tunnel? Analysis of calculated length and the length of the tunnel and then calculate the length of the tunnel. The train from the front to the rear of the car into the hole from the hole, take the long + long tunnel. The journey took 40 seconds at 8 meters per second. Solution: (1) train journey in 40 seconds: 8 * 40=320 (meters) (2) tunnel length: 320-200=120 (meters); A: the tunnel is 120 meters long. Learn at [] One team is 1200 meters long and travels at a speed of 80 meters per minute. The liaison in front of the team ran to the end of the line for 6 minutes to deliver the order. How many meters per minute do you ask the liaison officer? 3 cases of a train is 119 meters long, it runs at a speed of 15 meters per second, the speed of 2 meters per second from Xia