SOLUTION: A person departs Tucson driving east on I-10 at 65 mph. One hour later a second person departs in the same direction at 75 mph. Let D be the distance in miles between the two vehic

Question 1022941: A person departs Tucson driving east on I-10 at 65 mph. One hour later a second person departs in the same direction at 75 mph. Let D be the distance in miles between the two vehicles t hours since the first person left Tucson. Write a formula for D as a function of t.
I want see if this is correct?
Person 1: 65t
person 2: 75t
D=65t +75t
D=140t

Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

No.

hours after P1 departed, he was

miles from his starting point.

P2 didn't leave until one hour later, so P2's travel time is

hours, and

hours after P1 departed, P2 was

miles from the starting point.

The distance between them after

hours would be the difference between the two distances from the starting point, and the sign of this difference would tell you which of the two travelers were further along.

John

My calculator said it, I believe it, that settles it

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