Correct Answer - Option 1 : 115.2 km/h

**Given:**

Length of train = 130 m

Length of bridge = 110 m

Time taken to cross to bridge = 7.5 seconds

**Concept:**

The length calculated to cross the bridge is the length of the train and the bridge added together.

**Formula used:**

Speed = Distance/Time

Conversion from m/s to km/h = Multiply with 18/5

**Calculation**:

The total distance travelled by the train = 130 m + 110 m

⇒ 240 m

Speed of the train while crossing the bridge = 240/7.5 m/s

⇒ 32 m/s

Speed of the train in km/h = {32 × (18/5)} km/h

⇒ 115.2 km/h

**∴ The speed of the train is 115.2 km/h.**