2. A train travels with a constant speed of 56 miles per hour. How far can it travel in 1/2 hour?

Explanation:

speed*time=distance

56*3=168

so ,the train travel 168 miles in 3hours

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.