Please help me with this networks problem, thank you!

Consider a simple network that is composed of two computers (A & B) and a router X in the middle. Computer A is connected to router X by a link that is 10 Mbps and has a propagation delay of 10 msec. Computer B is connected to router X by a ink that is 1000 KBps and has a propagation delay of 20 msec. Answer the following questions [2 pts each: (a) What is the maximum rate at which computers A and B can communicate, via router X? (your answer should be in Mbps) (b) What is the physical distance between router X and computer B? Assume that the propagation speed of bits in the medium is the speed of light in vacuum. (your answer should be in Km) (c) Assume at time 0, computer A starts transmitting a 1500 Byte packet to computer B via X, how long would it take until computer B fully receives that packet? Assume that router X, would have to wait for the whole packet to arrive before it can send it out to computer B