A man crosses a straight 600 m street in 5 minutes at constant pace. What is his speed in km/h?

Introduction / Context:
Convert a meters-per-minute rate to km/h by appropriate unit conversions (m → km, min → h).

Given Data / Assumptions:

• Distance = 600 m.
• Time = 5 minutes.

Concept / Approach:
First compute m/s or m/min, then convert to km/h. 1 m/s equals 3.6 km/h.

Step-by-Step Solution:

Verification / Alternative check:
Direct conversion: 0.6 km in 1/12 h → 0.6 * 12 = 7.2 km/h.

Why Other Options Are Wrong:
They reflect wrong conversion factors between m/s and km/h, or minutes-to-hours errors.

Common Pitfalls:
Using 3.0 instead of 3.6 for the m/s to km/h factor; forgetting to divide by 60 to get m/s.

Final Answer:
7.2 km/h