- A13 and 7 km/h
- B13 and 8 km/h
- C12 and 10 km/h
- D14 and 8 km/h
Step-by-Step Solution
The two speeds must average to 10: (13 + 7) ÷ 2 = 10. The others average 10.5, 11 and 11.
Answer: A) 13 and 7 km/h
Which pair could be the downstream and upstream speeds of a boat whose speed in still water is 10 km/h?
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