Need serious help!

Consider the figure below, with three links, each with the specified transmission rate and link length.

Find the end-to end delay(including the transmission delays and propagation delays on each of the three links, but ignoring queuing delays and processing delays) from when the left host begins transmitting the first bit of a packet to the time when the last bit of that packet is received at the server at the right. The speed of light propagation delay on each link is 3x10*8 m/sec. Note that the transmission rates are in Mbps and the link distances are in km. Assume a packet length of L bits. Replace L by your student_ID*10. Give your answer in milliseconds.

Link 1 Link 3 Transmission rate: 100 Mbps Link Length 1 Km Transmission rate: 100 Mbps Link Length: 2 Km Transmission rate 10 Mbps Link Length: 5000 Km