Which ratio is equivalent to the unit rate
30 miles
1 gallon
? how was the unit rate transformed into the equivalent ratio?

a)
3 gallons
10 miles
; by dividing the numerator and denominator of the unit rate by 10.

b)
90 miles
5 gallons
; by multiplying the numerator and denominator of the unit rate by 3.

c)
6 gallons
180 miles
; by multiplying the numerator and denominator of the unit rate by 2.

d)
180 miles
6 gallons
; by multiplying the numerator and denominator of the unit rate by 6.