A person takes 4 hours to cover 15 km at constant speed. At the same speed, how much time will be required to cover 63 km (express your answer in hours and minutes)?

Introduction / Context:
Uniform speed implies distance is proportional to time. You can compute the speed first, or scale time by the distance ratio.

Given Data / Assumptions:

• 15 km in 4 h → speed = 3.75 km/h.
• Target distance = 63 km.

Concept / Approach:
Time = distance / speed; or scale 4 h by the factor 63/15.

Step-by-Step Solution:

Verification / Alternative check:
Proportion method: 4 h * (63/15) = 4 * 4.2 = 16.8 h = 16 h 48 min.

Why Other Options Are Wrong:
They correspond to other multipliers or rounding errors.

Common Pitfalls:
Misconverting decimal hours to minutes; using 3.8 instead of 3.75 by mistake.

Final Answer:
16 h 48 min