A bridge is linear and 23.0km long, and a train with length of 1.40km is trying to pass the bridge. At the beginning head of the train is at one end of the bridge, and the train

At the beginning,

Train is traveling at constant speed of 105km/h.

After passing the bridge,

So the distance travelled by the head is,
23.0 + 1.40 = 24.4 km

so, time = $\frac LV$ = $\frac{24.4}{105}$ = 0.232 hours