Speed[]
The Flash runs 40,000 light years in a day[]
Superman races the Flash which takes a day to happen according to Green Lantern.
Well, lets convert light years to metres for simplicity. Using a calculator a get back 378429000000000000000.
Using this calculator I plugin my values and get the result of 4.37997E+15 or 4,379,970,000,000,000c