Which number sequence follows the rule multiply by 3, starting from 4?

Right now it is noon you are traveling 75 miles per hour meaning you'll move 75 miles... every hour. so you're 120 miles away so now we need to figure out the time to do this we already know 1 hour is 75 miles so now you can subtract one hour 120-75= 45 so 75 per hour, what would 45 be? so we can set up a fraction to figure out how long it takes to travel one minute so 60/75(the 60 is for minutes in an hour). which is .8 of a second to travel one mile so now you can multiply to check your work. .8*75=60 mins so now multiply.8*45(miles left)=36 so you'd get there at 1:36 it would take an hour and 36 mins to get to your destination going 75mph