Problem:

Suppose A wants to send a $5$ MB file to B as a sequence of packets. Assume

packet size is $500$ bytes. To prevent any packet loss, when A sends a packet to B$,$

$B$ responds with a packet of size $50$ bytes as an acknowledgement to A that it has

received the packet successfully. Only after receiving the acknowledgement, A

sends the next packet. Assuming no losses, how long will it take for A to send the

entire file to $B?$ The link bandwidth is million bits per sec$)$ and assume

that the data travels through the link in both directions with the speed of light$($

$300,000k\frac{m}{sec}.$