It depends on how fast you can cycle.
an experienced rider with no hills and favourable weather on a good bike might do this in 50mins.
an inexperienced rider with hills and unfavourable weather on a cheap 40lb bike with flat tyres will never make it (or might with an overnight stop at the local hilton)
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Distance = (speed) x (time)Time = (distance) / (speed)= 1 / 20 hour = 3 minutes
1 knot = 1 nautocal mile per hour. So 428 nm @ 20 knots per hour will take 428/20 = 21.4 hours. After 12 hours, it is 20*12 = 240 nautical miles away. Its distance East is 240*cos(1.4deg) = 239.9 nautical miles and its distance South is 240*sin(1.4deg) = 5.9 nautical miles.
20 hours
20 miles at 16mph would take 1.25 hours. To complete the race in 2.5 hours, the final 30 miles must be completed in 1.25 hours ie 30/1.25 = 24mph
40 miles in 1 hour 2 miles in 2(1/40) of hour or in 1/20 of hour or in 60/20 = 3 minutes