- A2.5 hours
- B1.5 hours
- C1.875 hours
- D3.75 hours
Step-by-Step Solution
Downstream = (32 + 8) ÷ 2 = 20; upstream = (32 − 8) ÷ 2 = 12 km/h. Time = 30 ÷ 12 = 2.5 hours.
Answer: A) 2.5 hours
The sum of a boat's downstream and upstream speeds is 32 km/h and their difference is 8 km/h. How long will the boat take to go 30 km upstream?
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