A spring stretches 2 cm when a 10 N weight hangs on it. How far will it stretch with a weight of 20 N ?

4cm

Explanation:

If it's a simple ratio 2cm:10N to ?cm:20N, It should be 4cm:20N.

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.

the total distance traveled by the car is

30km + 49km = 79 km .