Bob's car gets 20 miles per gallon of gas. if bob's car is traveling at a constant rate of 60 miles per hour, how many gallons of gas will his car use in 30 minutes? enter your answer as an exact value.

If Bob goes 60 miles in 1 hour, then in 30 minutes (half the time) he will go 30 miles (half the miles).  We know he uses up just over one gallon of gas because his car uses 1 gallon in 20 miles and he has driven 30 miles.  Therefore, 30/20 = 3/2 or 1.5 gallons.

The answer for this is c because they both have the same amount and equal the same number you would get if you were to multiply them by their self