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a snail wants to climb out from the bottom of a 12-meter-hei

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a snail wants to climb out from the bottom of a 12-meter-height well .it falls down 2 meters
a snail wants to climb out from the bottom of a 12-meter-height well .it falls down 2 meters after it climbs up 3 meters every hour .how long in hours will the snail climb out of the wall.
一只蜗牛要爬出底部12米高度.它下降2米后,爬上3米每小时.时间将蜗牛爬出墙多久.
答案:10小时