SOLUTION: marie drove 90 mph to an appointment. on the way back she drove 80 mph. and it took her 1/2 hr longer because of traffic. how far did she travel to the appointment? use D=rt & t=d/

SOLUTION: marie drove 90 mph to an appointment. on the way back she drove 80 mph. and it took her 1/2 hr longer because of traffic. how far did she travel to the appointment? use D=rt & t=d/

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Question 469419: marie drove 90 mph to an appointment. on the way back she drove 80 mph. and it took her 1/2 hr longer because of traffic. how far did she travel to the appointment? use D=rt & t=d/r.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
n/90=n/80-1/2
8n=9n-360
n=360
Marie drove 360 miles to her appointment.
360/90=360/80-1/2
4=360/80-40/80=320/80=4..

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