Space travel MATH problem HELP!?

if a space ship must travel 70,million lightyears in two years, how fast must the space ship go? this isnt a homework problem its for a short story im writing

70 million lightyears is the distance that light would travel in 70 million years (at the speed of light)

in order to traverse this distance in 2 years, one must travel at 35 Million times the speed of light.

distance = rate * time
(70 Mcy) = (35 Mc) * (2 y)

70000000ly/2y=35 million light years/ year=35/365 light years/day=35/(365*24)lightyears/hour=5.87849981 × 10^12*35/(365*24) mph=3.99543379 × 10^9 miles per hour
or 3995433790 mph

The speed of light is 670,616,629.4 miles per hour. One light year is the distance light travels in one year. A light year is about 5.879×10 to the 12th power mi. (this format won't let me put the superscript of 12 on the 10). The two years is not relevant to the question. Just multiply 70 (70,000,000) million by the above number (5.879×10 to the 12th power mi or 5,879,000,000,000 mi) and you'll know, within reason, how many miles it travels in the 2 years. The answer I'll let you calculate. Hey, you have to do some of the work. Johnathan (Went from my head. You can check the figures in the wikipedia, online).