It began to snow on a certain morning, and the snow continued to fall steadily
throughout the day. At noon a snowplow started to clear a road at a constant
rate in terms of the volume of snow removed per hour. The snowplow cleared
2 miles by 2 pm and 1 more mile by 4 pm. When did it start snowing?
我假設地上雪量是V 雪下的速度是a
列出
dV
---=a-(這邊寫不出來)
dt
我知道後面那邊是要填清雪的速度
但是我方程式就是列不出來
謝謝高手幫忙!!!
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