SOLUTION: alberto left deshawn's house and drove toward the train station at an average speed of 65 mph. Dan left one hour later and drove in the opposite direction with an average speed of

Question 1131903: alberto left deshawn's house and drove toward the train station at an average speed of 65 mph. Dan left one hour later and drove in the opposite direction with an average speed of 25 mph. How long does dan need to drive before they are 425 mi apart?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
A drives at 65 mph and goes 65x miles in x hours
D drives at 25 mph and goes 25(x-1) miles in x-1 hours
they go apart at 65x+25x-25 miles per hour and that equals 425 miles
so 90x=450 miles
x=5 hours for A 325 miles
x-1=4 hours for D 100 miles ANSWER
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