GWD 21-6

[邁向高等學府]

At a certain carpet factory, if carpeting is moving continumously 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

Ans. A

我解出答案為C, 21600/(60*60)=6

是誤解題意了嗎？？
煩請大大解答…感溫啊…

[austi_co]

樓主的思維是沒有錯的
但是還少了一個步驟

每秒清除了6 square
但是題目問的是清除1 square要多少秒
所以要在除以6來確定清除1 square要多少秒
所以答案是A 1/6秒就可以清除1 square