Correct Answer: 8 km/h
Explanation:
Let rate of stream be 'a' km/h. According to the question. 24 + a = 2(24 - a) ⇒ 24 + a = 48 - 2a ⇒ 3a = 48 - 24 = 24 ∴ a = 24/3 = 8 km/h