If you left earth on january 1, 1990, and drove at an average speed of 55 miles per hour, day and night, on what day would you arrive on the moon?

You'd either have to know, or look up the distance from the Earth to the Moon. If you happen to not know it is...: 
238,900 mi

Now we just need to divide that amount by 55mph. What will happen is the miles will cancel out, and we will be left with the number of hours it will take to arrive on the moon. 

238,900 / 55 = 4343.636364 hours

Convert that amount to days! (You might want to use the fraction, because it's a bit easier to work with in my opinion)

(238900 / 55) / 24 = 180 days

 Now just look up a calendar and start counting! :)
You'll end up on: 

July 1rst

June 29 1990 because it takes 238900 mi from the earth to moon and the u divide it by 55 for the # of hours then divide that by 24 for the days then just do the subtraction