Using the formula: s = u*t + 0.5*a*t^2We get a time of 39.44 seconds for a bomb to reach the ground when dropped from an altitude of 25,000ft(without drag).In that time a bomber travelling at 250mph covers 2.74 miles - not 4.7 miles, for that you would need a bomber doing 429mph.
Wobble, let me make it a bit simpler. YOu are going 50mph in your 4x4 pickup truck with the gun rack and the nekkid lady mudflaps. You drop an unlit bottle rocket. Then you drop a lit bottle rocket. Which one is going to go farther?