- A2 km/h
- B4 km/h
- C3 km/h
- D1.6 km/h
Step-by-Step Solution
D : U = 20 : 12 = 5 : 3. (8 + s)/(8 − s) = 5/3 ⇒ 24 + 3s = 40 − 5s ⇒ s = 2 km/h.
Answer: A) 2 km/h
In the time a dinghy sails 20 km down a creek it can sail only 12 km up it. Its still-water speed is 8 km/h. What is the speed of the creek's current?
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