Answer:
641 times
Explanation:
Rate of transfer in 1989
2.4 kilobytes per second
Rate of transfer in a typical modem
1000 kilobyte per 0.65 seconds
Transfer per second for typical modem
1000/0.65=1538.461538 kilobyte per second
Comparing typical modem to 1989

=641.025641 times faster
Rounding off, this is 641 times faster
Therefore, ans=641 times