在相隔2000km的两地间通过电缆以4800b/s的速率传送3000比特长的数据包，从开始发送到接收数据需要的时间是（ ），如果用50Kb/s的卫星信道传送，则需要的时间是（ ）。
问题1选项
A.480ms
B.645ms
C.630ms
D.635ms
问题2选项
A.70ms
B.330ms
C.500ms
D.600ms
正确答案及解析
正确答案
解析
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