Answer :
6.-
2 mi ----------------------- 40min
x -------------------- 25 min
x = (25 x 2)/40
x = 50/40
x = 1.25
he swam 1.25 mi after 25 min
7.-
3feet ----------------------- 2 lb
12 feet ---------------------- x
x = (12 x 2) / 3
x = 24/3
x = 8 lb weight
1 foot --------------------- $5
12feet --------------------- x
x = (12 x 5) / 1
x = $60