Finding Speed, Distance, and TimeDate: 10/31/2002 at 09:07:29 From: Valerie Lynch Subject: Science Time = distance/speed. Does this symbol (/) mean that distance divided by speed will give you time? Date: 10/31/2002 at 10:11:58 From: Doctor Ian Subject: Re: Science Hi Valerie, In a manner of speaking, yes. We _define_ speed as distance divided by time, speed = distance / time but once we have the equation, we can use any of its variations, speed = distance / time distance = speed * time time = distance / speed to compute any one of the quantities when we happen to know the other two. For example, suppose we drive for 2 hours at 30 miles per hour, for a total of 60 miles. If we know the time and the speed, we can find the distance: 2 hours * 30 miles/hour = 60 miles If we know the time and the distance, we can find the speed: 60 miles / 2 hours = 30 miles/hour If we know the speed and the distance, we can find the time: 60 miles / (30 miles/hour) = 2 hours It's a little like having a family of multiplication facts, e.g., 12 = 3 * 4 3 = 12 / 4 4 = 12 / 3 Does this make sense? - Doctor Ian, The Math Forum http://mathforum.org/dr.math/ |
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