Final answer:
The speed limit in the airspace underlying class B airspace or within a VFR corridor depends on the type of airspace and altitude.
Step-by-step explanation:
The speed limit in the airspace underlying class B airspace or within a VFR corridor is determined by the type of airspace and the altitude at which the aircraft is operating.
Under the Federal Aviation Regulations (FARs), the speed limit for aircraft below 10,000 feet in Class B airspace is 250 knots (287 mph). Above 10,000 feet, there are no specific speed limits in Class B airspace.
In VFR corridors, which are designated routes that allow VFR (Visual Flight Rules) traffic to avoid Class B airspace, the speed limit is typically 200 knots (230 mph) below 3,000 feet AGL (above ground level).