During the two minutes after the passage of a heavy aeroplane in cruising flight, hazardous wing tip vortices will
Why this is the answer
Per TC AIM-AIR (Wake Turbulence), vortices from a heavy aeroplane in cruise dissipate very slowly; the wake shows little break-up at 2 minutes. The distractors overstate how fast the hazard clears — in cruise it lingers well behind the generating aircraft.
Reference
TC AIM-AIR – Wake Turbulence
Question reproduced verbatim from Transport Canada’s PSTAR Study and Reference Guide (TP 11919E). The answer key is Transport Canada’s; the explanation is ours.
A study aid — not a substitute for the official guide, the CARs, or your instructor.