MARTINI said if it takes you 80 min. to travel 60 km. then your AVERAGE speed is 45km/h. NO it is not AVERAGE speed. 45kmh is just the exact speed that you traveled the 60km and it took a duration of 80 min., as I said before. Also those numbers do not factor in both speeds, you think it does but look carefully because it doesn't. The reason why is because you have to do the formula twice (since there are two different speeds) to get the average.

**Martini** asked you to respond to his posts so he could get somewhere explaining why you're wrong. You're ignoring this simple request and repeating what doesn't make sense. He asked what you believe 45 km/hour is an exact speed of. Why repeat that again without answering the question?

So I'll repeat the question. If the first half of the trip was at 30 km/hour and the second half at 90 km/hour, what is 45 km/hour the exact speed of? That speed is an

*average speed* for the trip.

EXAMPLE: If I traveled 30 km at 30kmh. Then traveled 30 km again at 90 kmh. What do you think my AVERAGE speed will be for the ENTIRE trip?????

30 kmh + 90 kmh = 120 kmh : 120 kmh / 2 (since two different speeds where used) = 60 kmh FOR THE ENTIRE DISTANCE of 60km.

These formulas Calculate SPEED, TIME and DISTANCE : SPEED = Distance / Time

TIME = Distance / Speed

DISTANCE = Speed x Time

They DO NOT calculate an AVERAGE.

Then what speed do they calculate? Please, read the links in

**Martini**'s last post!

You see you are misinterpreting what AVERAGE is. To get the average speed for the riddle you would have to calculate it this way. IT'S LIKE FOLLOWING AN ORDER OF OPERATION.

First Half of trip you traveled 30 km at a rate of 30kmh. Second half of the trip you traveled 30 km at a rate of 90 kmh. The average speed between 90kmh and 30kmh is 60kmh!

So, if you travel for 59 minutes at 70 mph and 1 minute at 10 mph, your average speed for the trip was 40 mph? No, if you traveled at an average speed of 40 mph for an hour's long journey, then you only drove 40 miles. Since you drove 70 mph for 59 minutes, you obviously drove a lot longer.

IF YOU WANTED TO SEE...

Please don't write in all caps. It only makes reading annoying and it doesn't help your case.

AND TO SEIAI, I DON'T KNOW WHO YOU ARE BUT WOW, YOUR MATHEMATICAL SKILLS AND PROBLEM SOLVING METHODS ARE AMAZING.

Then maybe his last post will convince you. By the way, someone agreeing with you about simple math doesn't make his methods AMAZING.

For reasons that I'm not going to get into right now, I'm going to revise my answer.

The reasons have been explained many times; no need to get into them.

You would have to speed up infinitely fast in order to average 60 km/hr.

Which IRL might not be practical, but meh.

Forget practical. It's not possible.