Multiplying one table by another which is not unique

Hi, I could really do with some help please;

I have two tables

Table 1 contains Home Venue, Away Venue and Ticket Qty

Table 2 contains Home Venue, Away Venue and Mileage ( between home and away)

I have a many to many relationship between table 1 & 2 using home venue

I have created a calculated column in table 1 to show quantity where away venues are the same

=SUMX(FILTER('table 2',[Away venue]=Table1[Away venue]),'Table 1'[Quantity]) this has worked fine

I now need to multiply the quantity in Table 1 by the mileage in Table 2 (not unique) 

so in the example above - 10 * 100 = 1000

I'm stuck on how to do this ( it seems like it should be simple), can anyone point me in the right direction?