alleryA boat moves at 12 km/h in still water; the stream is 3 km/h. Time for 27 km downstream and back?
A4 h
B4.5 h
C4.8 h
D5 h
Answer & Solution
Correct answer: C. 4.8 h
Downstream and upstream times are 27/15 and 27/9 hours, totalling 4.8 hours.
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