Atrain travels 77 kilometers in 3 hours, and then 82 kilometers in 4 hours. what is its average speed

the average speed is 24.57 km/hr

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

i will answer your question if you answer mine