A train is 700 meters long, passing through a bridge at the speed of 400 meters per minute. It takes 5 minutes from the front of the train to the rear of the train. How long is the bridge?

A train is 700 meters long, passing through a bridge at the speed of 400 meters per minute. It takes 5 minutes from the front of the train to the rear of the train. How long is the bridge?

400x5-700
=2000-700
=1300 m
A: Daqiao is 1300 meters long
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It takes 1 minute and 30 seconds for a train to pass a 2000 meter long bridge at a speed of 25 meters per second. How long is the train?

1 minute 30 seconds = 90 seconds 25 × 90 = 2250 meters 2250-2000 = 250 meters

An iron bridge is 1000 meters long. A train passes through the bridge. It takes one minute for the train to get on the bridge and then completely cross the bridge. The time for the whole train to be completely on the bridge is 40 seconds (from the rear of the train to the front of the train about to get off the bridge). How about the speed and length of the train?

1 minute = 60 seconds, all pass: S1 = l bridge + L, T1 = 60s, all on the bridge: S2 = l bridge - L, T2 = 40s, suppose the speed of the train is v m / s, the length of the train is l m, then 60s × v = 1000m + l40s × v = 1000m − L, the solution is: v = 20m / s, l = 20m