Ireally need with this word problem!
a certain car that is being tested by its manufacturer uses its entire fuel supply in about 38 hours when idling. the same car, when driven at 60 miles per hour on a test track, uses about three-and-a-half times as much fuel per hour as it does when idling. if the engine has been idling for 10 hours and the car is then run at 60 miles per hour, how much longer will the car run before it uses up all of its fuel?
include how you did this problem ! ! : )