Why does 5 mph slower feel like it adds a bunch of time but 5 mph faster doesn’t affect the eta much.

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Something that’s always bothered me about driving is I can drive 5 mph over and barely speed up the gps, however if I accidentally drive 5 under the speed limit, (My brand new truck doesn’t have a speeding) it will add a bunch of extra time. Is there an equation or something that shows you how fast you’d have to go to actually lower the time needed to arrive. Is it just a mental thing or is it math. Any and all information welcome!

In: Mathematics

6 Answers

Anonymous 0 Comments

5 MPH faster decreases the time less than 5 MPH slower increases it, but only marginally. As allowable speed increases, the amount of time saved by speeding 5 MPH over decreases. There is an equation to show the relationship between time saved and allowable speed. Know this, if the limit is 60 MPH and you go 70 MPH you will save only 1 minute over a distance of 12 miles.

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