24. It takes 4 hours for a motorboat to travel downstream from X to Y. To return upstream from Y to X it
takes the motorboat 6 hours. How many hours would it take a wooden log to be carried from X to Y by
the current, assuming it is unhindered by any obstacles?
(A) 5 (B) 10 (C) 12 (D) 20 (E) 24
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