hell no. running is so much less efficient than biking... you think running 30 miles is as easy are biking 90? it isn't.

i'd say it's closer to 1:5 when under five miles of running, and closer to 1:10 when over ten miles of running, with the slope of the curve increasing exponentially.

of course, the athlete's personal physiology and predispositions/proficiencies/strengths will drastically change the distances and amounts. i don't run, so i could probably just as easily bike 60 miles at a strenuous pace as i could run 5. furthermore, i bet i could bike 60 miles at 16mph where i could only run 5 miles at maybe 7, or 8. last time i ran a 5 mile was 13 years ago and i did it in 45'. i'd be surprised if i could break 40' now that i'm stronger and have greater endurance and a much longer stride.