How many seconds does it take for a modem to transmit a message at a rate of 28800bit / s to transmit 100 pages of text in 30

How many seconds does it take for a modem to transmit a message at a rate of 28800bit / s to transmit 100 pages of text in 30 lines of 60 characters each, provided that each character is encoded in 1 byte?

Given: v = 28800 bps, i = 1 byte = 8 bits, k = 180000 char
Find: t =?
Decision:
1) I = v * t
2) t = I / v = k * i / v
3) t = 180,000 char * 8 bit / 28800 bit / s
4) t = 50 s
Answer: 50 seconds.