Ladder problem

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A ladder of length 5 m ist leaning against a vertical wall at an angle of 60° to the horizontal. The foot of the ladder moves in by 50cm. By how much does the top of the ladder moves up the wall?

The given ans is 25.24, i didnt come to this ans after hours of trying
 
Beer inspired diagram and query follows.
A ladder of length 5 m ist leaning against a vertical wall at an angle of 60° to the horizontal. The foot of the ladder moves in by 50cm. By how much does the top of the ladder moves up the wall?

The given ans is 25.24, i didnt come to this ans after hours of trying
Screenshot_20211205-100540_Chrome.jpg
Given:
B1A1C=60°\angle B_1A_1C=60° with A1B1=5|\overline {A_1B_1}|=5
What do these tell you about the coordinates of B1B_1?
 
Another way of saying the same thing as Jonah is:
Firstly, find the base and height (using trig) of the triangle with vertices A1, B1 and C.
 
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