- A9
- B5
- C10
- D7
Step-by-Step Solution
Downstream = 28 ÷ 2 = 14 km/h, upstream = 28 ÷ 7 = 4 km/h. Still-water speed = (14 + 4) ÷ 2 = 9 km/h (the stream is 5 km/h).
Answer: A) 9
Going with the stream, Salim's boat travels 28 km in 2 hours; coming back against the stream, the same 28 km takes 7 hours. Find the boat's still-water speed in km per hour.
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