Assuming you are rounding the answer:
One's place = 680
Ten's place = 700
Hundred's place = 1000
3 minutes
10*8*12=960 cubic inches
960/320inches per minute =3
Okey I help you
3x+5y=26
5*/2x-y=13
3x+5y=26
10x-5y=65
+------------------
13x= 91
x=7
3x+5y=26
3*7+5y=26
5y=5
y=1 ,,
Hope it helps :))
I’m pretty sure it’s 20 could be wrong