After reading When Logic And Intuition Fail, someone asked me about a related paradox you may have heard about.

Let’s say you drive to work at 40 mph, and come back at 60 mph. What was your average speed?

It’s natural to think your average speed was 50 mph, but it was actually 48 mph. It would be 50 mph if you spent the same amount of time at both speeds. But since you’re spending more time at 40 mph than you are at 60 mph, your average speed has to be less than 50 mph.

If you’re driving to the beach, you might try to hold steady at 60 mph. But you won’t be able to stay exactly at that speed. You’ll sometimes be going a little faster, and sometimes be going a little slower. Even if the fast periods perfectly cancel out the slow periods, your average speed will still be less than 60 mph.

If you use cruise control, you not only save effort and gas, you also save time. That’s what slow and steady (emphasis on the steady) does for you.

And it’s one reason why you’re more productive when you do things at a steady pace, instead of slacking off and trying to make up for it later. It’s better to put your efforts on cruise control.