January 2008 SAT Hard Math Question HELP #18

comfortablycurt
Sat, 27 Jul 2013 04:11:53 +0000

Calculate the length of time, and divide by the distance. 10 miles at 20 mph would be half an hour. 10 miles at 40 mph would then be half of that, 15 minutes, giving you 45 minutes, or .75 hour of total travel time. 20 miles/.75 hour = 80/3, as noted above, or 26 and 2/3 miles per hour.