Posted: 5/17/2006 4:58:35 PM EDT
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My brain is not up to speed. My daughter has a simple algebra problem but naturally being in high math she can't remember how to figure this out and I can't remember how to set up this problem. We're not asking someone to solve this equation for us just help us right it as an equation so we [her] can figure it out. Its a story problem: Sally is going to college 320 miles away. Her dad is taking her furniture in a moving van and she'll be driving her car. Her dad can only drive 55 mph while Sally can drive 65 mph. Sally gives her Dad a 30 minute head start. How far from home will she be before catching up with him? |
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distance = rate * time dad = (55mph * 0.5hr) + (55mph * T) sally = 65mph * T set dad = to sally and solve for T then plug T back into the equations to get the distances traveled. ETA: it's been a long day at work, and i still have about 4 hours to go....i think this is like half of it...probably not though. 
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[golfclap] that was quick [/golfclap] |
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Sally = 65mph Dad = 55mph After the first half hour the Dad was 27.5 miles along (55mph*.5hrs). Since Sally will be traveling 10mph faster then her father, it will take her 2.75hrs (10mph*2.75hrs= 27.5miles). She was traveling at 65 for 2.75hrs, so she went 178.75 miles. |
But wouldn't Dad continue traveling? |
