7910 needs correction?

[aks]

7910: If there is a pedestrian crossing or a zebra crossing within (…) meters, pedestrians must use it.

Isn’t the answer should be 20? But it says 30.

[Rafael]

You're right, the question has been updated. Thanks for the heads-up!

[Inazuma]

Isn’t the answer should be 20? But it says 30.

It's been changed recently from 30 to 20 ...