Q: "Three boys racing against each other on the track." Does this mean that "Three people racing against each other on the track."?
A: yes

Q: "Woman wearing black snow gear walking down a snow covered slope." Does this mean that "The woman is walking over snow."?
A: yes

Q: "three pairs of underpants are hanging from a line under a red shelter." Does this mean that "The underpants are drying outside under the cover."?
A: it is not possible to tell

Q: "A crowd waits to interact with some people in an indoor location." Does this mean that "There are many people togther inside."?
A:
yes