题目内容
一座大桥长1.6km，一列长200m的火车以10m/s的速度通过此桥，则所需要的时间为（ ）
| A．120s | B．140s | C．160s | D．180s |
t=
=
=180s．
故选D．
| S |
| V |
| 1600m+200m |
| 10m/s |
故选D．
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题目内容
| A．120s | B．140s | C．160s | D．180s |
| S |
| V |
| 1600m+200m |
| 10m/s |