Use reasoning to lead to the answer of the following question:
A boy runs 200 metres in 24 seconds. What is his speed ?\nOptions:\n(A) 20 km/hr\n(B) 24 km/hr\n(C) 28.5 km/hr\n(D) 30 km/hr\n(E) 35 km/hr

(D)
200/24 * 18/5 = 30 km/hr.

The answer is (D)