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标题: GWD21-6 [打印本页]

作者: puccamummy 时间: 2005-11-14 01:07
标题: GWD21-6

GWD21-6

At a certain carpet factory, if carpeting is moving continuously through a dryer at a constant rate of 21,600 square feet per hour, how many seconds does it take for an area of 1 square foot of carpeting to move through the dryer?

A 1/6

B 1/3

C 6

D 36

E 60

我选C 但是答案是A 怎么回事呢？

作者: charmant 时间: 2005-11-14 08:14

一小时3600秒，21600尺布，一秒钟就6尺。一尺就1/6秒

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