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  3. While working on a case Dr Watson accidentally fell down a 30ft dry wishing well

While working on a case Dr Watson accidentally fell down a 30ft dry wishing well

游客2024-08-08  10
问题 While working on a case Dr Watson accidentally fell down a 30ft dry wishing well. Sherlock Holmes lowered him down a rope.
    "Can you climb up?" shouted Holmes.
    "I’ll be out before you know it. " came Watson’s reply.
    But the climb wasn’t as easy as Watson had first imagined.  Each hour he managed to climb 3ft--but slipped back 2ft.

    How long did it take Watson to get out?
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答案 28 hours
解析 他一小时爬3ft，倒退2ft，就相当于一小时爬1ft，当他爬了27小时后，爬了27ft，那么剩下的3ft正好还需要一个小时，故共需28小时。
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