Many interesting solutions were presented. Note that if you just write 3.15 as III.XV, its not clear how 3.0015 should be represented. The problem with the Roman numeral system is, it doesn't have a zero. Here is a web page about dibble dabble multiplication . Just about everybody did fine with this story problem.
Fiber optic is plenty fast enough for the task.
Notice that you had to make some reasonable assumptions here. Be clear about your reasoning on a test. Some very cool ideas about hand signals. 1024 is the number of values that can be represented in 10 bits, but that has nothing to do with baud or bps. Everybody did fine, pretty much.