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# If such a car travels 220 miles in 4 hours, how long does it take to travel 385 miles?

wrote...
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10 years ago
 If such a car travels 220 miles in 4 hours, how long does it take to travel 385 miles? For a car moving at a constant speed, the distance traveled varies directly with the time spent driving. If such a car travels 220 miles in 4 hours, how long does it take to travel 385 miles? Read 813 times 9 Replies

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wrote...
10 years ago
 7 hours
wrote...
10 years ago
 Hi,7 hours <==ANSWER220 . . 385------ = ------ 4 . . . . x220x = 4(385)220x = 1540 x = 7I hope that helps!!
wrote...
10 years ago
 4 hours = 220 milesHow many hours does it take to go one mile? = 4 / 220Now multiply that by 385 to get how many hours it takes to go that far.Then use the decimal portion of the answer and multiply it by 60 to get minutes.Then use the decimal portion OF THAT and times it by 60 to get seconds (if any).
wrote...
10 years ago
 7 hours. you do 220 divided by 4 to find out the distance per hour (55 mph). Then you do 385 divided by 55 to find 7 hours.
wrote...
10 years ago
 Figuring out from the already given statistics, it travels 220 miles in four hours, that means it's going at a rate of 55 miles per hour. 385 miles/ 55 = 7 hours.
wrote...
10 years ago
 Since the distance traveled varies directly as the time spent driving, we have that:D = kt, where D is the distance, k is a constant, t is the time spent driving.Since D = 220 when t = 4:220 = 4k ==> k = 55.So, the equation that relates D and t is:D = 55t.When D = 385:385 = 55t ==> t = 7 hours.I hope this helps!
wrote...
10 years ago
 Since speed is constant. you can find speed using the first two givens (220miles and 4 hours)distance: 220 milestime: 4hoursspeed = distance/time         = 220/4         = 55miles/hrand if you traveled 385 milesdistance: 385 milesspeed = 55miles/hrtime = distance/speed       = 385/55       = 7hrsAnswer: 7 hours!
wrote...
10 years ago
 to solve this, you can make a proportion. it will be: miles/hours =miles/hoursso: 220/4=385/x  (x is the number of hours you are looking for)-use cross product and get: 220x=385(4)220x=1540 (divided by 220)x=77 hours is you answer
wrote...
10 years ago
 Use this formula to find that:Rate of travel (R) * Time of travel(T) = Distance traveled(D)We don't get the rate of travel, but we get the time and distance. That allows us to find the rate w/ this equation.R*4 = 220R = 55now, we plug that value and the new distance to get our new time.55*T = 385T = 7It takes 7 hours to travel 385 miles at a constant speed of 55mph.Hope that helps!
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