- A3 km/h
- B4 km/h
- C1.6 km/h
- D2 km/h
Step-by-Step Solution
Round-trip average = km/h. (1.6 = 10 − 8.4 is a trap.)
Answer: B) 4 km/h
A boat with still-water speed 10 km/h goes upstream and back down to its start. Its average speed for the round trip is 8.4 km/h. Find the speed of the stream.
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