alleryWith downstream speed 18 km/h and upstream speed 10 km/h, how fast does the river flow?
A2 km/h
B8 km/h
C14 km/h
D4 km/h
Answer & Solution
Correct answer: D. 4 km/h
Stream speed is half the difference, (18 - 10) / 2 = 4 km/h.
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