Road Under ConstructionDate: 9/8/96 at 23:13:54 From: Anonymous Subject: How Much Road Was Under Construction? Adam made a trip to see his college friend. The college is 295 miles from Adam's house. He averaged 50 miles per hour (mph)) for most of the trip but only 40 mph for the part where the road was under construction. If the trip took 6 hours, how many miles of the road were under construction? Date: 9/9/96 at 22:59:19 From: Doctor Jerry Subject: Re: How Much Road Was Under Construction? Here's a suggestion for getting started on this problem. Concentrate first on the times needed for the two parts of the trip. Once you have the times, then you can figure out the two distances. If T1 and T2 are the times (in hours) for the good road and bad road parts of the trip, then T1 + T2 = 6. The distances travelled during the two parts of the trip would be 50*T1 and 40*T2. You can form these two into an equation and then solve the two equations in two unknowns. Okay? -Doctor Jerry, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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