Question about passenger seat width

[marcofreeman]

Hello, The question is The width of the driver's passenger seat should be (…) cm. The answer is 55cm.

I still don't understand this sentence clearly. Can you explain it to me?

[Inazuma]

That's the minimum width of the driver's seat

It's not the passenger's seat width ...
That would be minimum 43cm in a bus, and 40cm in other vehicles