The fourth grade math problem is that the first grade math problem is that the bridge length is 4600 meters, the train length is 160 meters, and the train is 30 meters per second. How long does it take for the train to get in and out of the bridge? A clear concept in this topic is that the distance a train travels from entering the bridge (the front of the train enters the bridge) to leaving the bridge (the rear of the train leaves the bridge) is the length of the bridge+the length of the train.

Solution: (4600+160) ÷ 30 ≈158.67 seconds.

A: It takes 158.67 seconds for the train to get in and out of the bridge.