Sorry for slow reply. Can you let me know exactly which workout you are referring to in the Level 3 plan? Was it RMP5 – as I did find that error in the description of that workout (the structured workout is correct though).
This is the corrected distances for that workout.
1 km (0.6 mile) Zone 1
15 km (9.3 miles) in Zone 2
16 km (9.9 miles) @ MP