Pole crossing at 72 km/h – find length A train moving at 72 km/h crosses a pole in 15 s. What is its length?

Introduction / Context:
The pole is a point obstacle; the entire train passes by, so distance equals the train length. Apply unit conversion and multiply speed by time to get the length.

Given Data / Assumptions:

• v = 72 km/h = 20 m/s.
• t = 15 s.

Concept / Approach:
L = v * t after converting to m/s.

Step-by-Step Solution:

Verification / Alternative check:
Reverse: 300 m / 20 m/s = 15 s, consistent.

Why Other Options Are Wrong:
150 m, 200 m, 350 m: Each contradicts the exact multiplication result.

Common Pitfalls:
Leaving units as km/h and seconds without conversion leads to wrong answers.

Final Answer:
300 m