An airplane took 2.5 hours to fly 625 miles with the wind. It took 4 hours and 10 minutes to make the return trip against the same wind. Find the wind speed of the plane in still air

The wind speed of the plane in still air is 50m/h

Explanation:

Let p = plane speed in the air

Let w = wind speed.

since , we can;

(Eqn1) can be simplified further into

In (Eqn2), multiply both sides with the reciprocal of which gives us

So we have;

p - w = 150

p + w = 250

2p = 400

p = 200

Put p (200) into p - w = 150;

200 - w = 150

w = 50

Therefore,

The speed of the plane in still air is 200m/h,

The wind speed is 50m/h.

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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.