A train travels 72 km in 1 hour. What is its speed in m/sec?

Question:

A train travels 72 km in 1 hour. What is its speed in m/sec?

(A) 20 m/sec

(B) 60 m/sec

(C) 100 m/sec

(D) 120 m/sec

Answer: (A) 20 m/sec

Solution:

We know speed = distance/time.

So, speed = 72 km/hr

= 72 * 5/18 m/sec (as 1 km = 5/18 m)

= 20 m/sec.