- A3
- B9
- C6
- D4.5
Step-by-Step Solution
Downstream speed = 36/3 = 12 km/h, upstream = 36/6 = 6 km/h. Stream speed = (12 − 6)/2 = 3 km/h.
Answer: A) 3
A launch takes 3 hours to travel 36 km downstream and 6 hours to come back the same 36 km upstream. What is the speed of the stream in km/h?
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