Suppose y varies directly with x and inversely with z. When x=60 and z=5. Find the constant of variation and the equation of combined variation

How do i do this? i don’t understand

Rick is driving to his uncles house in greenville, which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?