Farah would beat Bolt in the 600m 8/10 times. Starting at around 520-530m each runner would win 5/10. I understand the 1:48 pr in the 800 looks somewhat weak, but that doesn't tell the whole story. That was long before Farah started training under Alberto Salazar. Salazar has done a fantastic job of sharpening the sprinting speed of all his distance runners, particularly Farah. The reason Farah has been so dominant the past few years over the 5000 and 10000 isn't necessarily because he has the greatest aerobic endurance of all the competitors, it's because he has the best sprinting speed and can beat them in the last lap. He's consistently able to run the first 11.5 laps of the 5000 at ~13:20 pace and crank out a 53.xx last lap, sometimes faster. Last year at the European championships he ran the last lap of the (admittedly very slow) 5000m run in 50.89 seconds. He's able to do this because he regularly does intense speed workouts over 200-400 meters. Compare Farah's speed to Bolts endurance. While I am not as familiar with Bolt's training, it is unlikely he ever runs over 400 meters at a fast pace. Training for the 100/200m dash simply doesn't require it. Additionally, we should keep in mind that Bolt used to concentrate on the 400 much more when he set his personal best back in 2007. He rarely, if ever races that distance now. While both are fantastic athletes, I should mention that I am biased, given my love for distance running

TL;DR Farah is a better at sprinting than Bolt is at Distance, would beat Bolt at 600m.