A train 50 m long passes a platform 100 m long in 10 seconds. Find the train’s speed in km/h.

Introduction / Context:
Total crossing distance over a platform equals train length plus platform length. With time given in seconds, compute speed in m/s and convert to km/h.

Given Data / Assumptions:

• L_train = 50 m; L_platform = 100 m.
• t = 10 s.

Concept / Approach:
S = 150 m; v = S/t = 150/10 = 15 m/s; v_kmph = 15 * 3.6 = 54 km/h.

Step-by-Step Solution:

Verification / Alternative check:
Matches result in earlier similar case (99384) after conversion.

Why Other Options Are Wrong:
10, 15, 36, 100 km/h follow from mis-summing distances or skipping conversion.

Common Pitfalls:
Taking only train length; forgetting 1 m/s = 3.6 km/h.

Final Answer:
54 km/h