Update min max date with join

I have 2 tables CONT and CUMU, the two table have the same field named RAPP(txt property)

In CONT have a filed named DATA (as date short)

In CUMU have a field DAL (FROM in english) and a field AL (TO in english)

With a join on RAPP, i need to extract the Min and Max Date from CONT.DATA and insert Min date value in DAL and Max date value in AL

How to with a query?

note; i work with ADO, Access databse and vb6 classic