- A3 hours
- B2 hours
- C2.4 hours
- D4 hours
Step-by-Step Solution
20 − s = (2/3)(20 + s) ⇒ 60 − 3s = 40 + 2s ⇒ s = 4. Upstream = 16 km/h. Time = 48 ÷ 16 = 3 hours.
Answer: A) 3 hours
A motorboat's upstream speed is two-thirds of its downstream speed, and its speed in still water is 20 km/h. How long will 48 km upstream take?
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