Final answer:
The question requires calculating terminal velocities and descent times for skydivers based on their masses and assumptions about drag, which cannot be accurately answered without additional information like frontal area and drag coefficient. Terminal velocity calculations require understanding of physics principles and approximations, which, in this case, is insufficient to confirm any of the given options.
Step-by-step explanation:
The question is asking us to calculate the terminal velocities of two skydivers of different masses and their time to reach the ground from a certain altitude, assuming they reach terminal velocity almost instantly. Using the information that a skydiver with a mass of 75 kg can achieve a terminal velocity of about 350 km/h (approximately 97.2 m/s) in a pike position, we can make an assumption for the frontal areas needed for the calculations.
However, the precise drag coefficient value, which depends on the position of the skydiver and the shape and frontal areas, is not given, which would be critical for an accurate calculation.
Approximations are required here since not enough information is provided to calculate precise terminal velocities without assuming or knowing the frontal area and the drag coefficient of the skydivers in their specific body positions.
For the time to reach the ground, assuming immediate acceleration to terminal velocity is not realistic due to the presence of acceleration due to gravity and the fact that increasing speed would also increase air resistance until it balances out with the force of gravity.
Usually, skydivers take several seconds to reach terminal velocity.