Given that point B is the midpoint of line ad, point C is the midpoint of line BD, CD = 2.5cm, please find out the length of line AB, AC, ad and BD?

Given that point B is the midpoint of line ad, point C is the midpoint of line BD, CD = 2.5cm, please find out the length of line AB, AC, ad and BD?

AB=5
AC=7.5
AD=10
BD=5