I need help with this problem. The second part of the problem can be estimated!?

Question

A 800 N man on a 70 N mountain bike rides through a mud puddle on the trail. Would he make a deeper impression in the mud than a 500 N teenager driving a 4000 N ATV through the same mud puddle? Estimate the contact area of the ATV tires and the bicycle tires, then use the pressure equation to calculate the pressure in each situation.

Answer 1

Aa (ATV contact area) ~ 4 * 25 *25 = 2500 cm^2
Ab (bike contact area) ~ 2 * 5 *10 = 100 cm^2

Pa (ATV pressure) = 4500/2500 = 1.80 N/cm^2
Pb (bike pressure) = 870/100 = 8.70 N/cm^2

Based on the assumptions here...yes.