It takes 36 seconds for a train to cross the1500m bridge and 4 seconds to cross the bridgehead sentry. How long is the train?

Assuming that the train runs in a straight line at a constant speed, the average speed can be calculated as follows:1500m divided by 36 seconds is about 41.67m/s. ..

Four seconds after passing the bridgehead whistle refers to the time from the locomotive passing the whistle to the end of the train. During this period, the train still uses the speed of the bridge, so the length of the train is the distance traveled by the sentry for 4 seconds: 4 seconds times the average speed of 465,438+0.67 m/s, which is 65,438+066.67 m. ..

Train conductor 166.67 meters.