If 180 meter long train crosses a pole in 9 seconds, find the speed of train in kilo meter/hour.

72 km/h

The correct answer is Option 1: 72 km/h

When a train crosses a pole, it travels a distance equal to its own length.

Step 1: Distance covered

Distance = 180 m

Step 2: Speed in m/s

Speed = Distance / Time

Speed = 180 / 9 = 20 m/s

Step 3: Convert to km/h

1 m/s = 3.6 km/h

Speed = 20 × 3.6
Speed = 72 km/h