Discuss Forum
1. A boat sailing against a stream of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travel the same distance. What is the speed of the stream?
- A. 1/2 km/hr
- B. 1/2 km/hr
- C. 1/2 km/hr
- D. 1/2 km/hr
Answer: Option B
Explanation:
Let,
Speed of stream = y &
Speed of boat = x
ATQ,
x - y = 24/6 = 4— (i)
x + y = 24/4 = 6 ——– (ii).
From,
(ii) – (i),
x + y - x + y = 6 - 4
Or, 2y = 2
Or, y = 1
∴ Speed of stream = 1 km/hr (ans)
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