Gondolas of an aerial cableway:

When the two gondolas are passing each other, the younger one says:

"Just exactly at this moment, we have covered half of the distance!"

"What rubbish..." the older one says,
"...You do not know the length of the whole cableway at all, so you can not know either where half of the distance is!

Which one of the two is right?

• the older one
• the younger one
• none of them