maximum distance - any easy steps

[kishokbabu]

An automobile gasoline mileage varies, depending on the speed of the automobile, between 18 & 22.4 miles per gallon, inclusive. What is the maximum distance, in miles, that the automobile could be driven on 15 gallons of gasoline?

a) 336
b) 320
c) 303
d) 284
e) 270

[rijul007]

mileage range = 18 to 22.4 miles per gallon

Max distance= max mileage*gallons=22.4*15 =336

Option A