A boat moves 25 km upstream and 39 km downstream in 8 hours. It travels 35 km upstream and 52 km downstream in 11 hours. What is the speed of the stream if it travels at a uniform speed?
A. 4 km/h
B. 5 km/h
C. 6 km/h
D. 3 km/h
Answer: Option A
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Can anyone explain?