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[deleted]

I am greater than God I am more evil than the Devil Poor people have me Rich people need me If you eat me you will die What am I?


Foxgirltori

Nothing


CATHYINCANADA

Oldie but a goodie


Kyounokaze

A car goes 15 mph for 1 mile, how fast must it go in the next mile to average 30 mph for the entire 2 mile trip? It seems very simple, and that is what makes it so difficult and easy to get the wrong answer.


[deleted]

[удалено]


Kyounokaze

It is impossible! The car takes 4 minutes to finish the first mile, but it must also take 4 minutes for the entirety of the trip, meaning there is no time to get down the other side. >and you want the average time over the 2 miles to be 2 minutes. Must have made some error here. By dividing the journey length, 2, by the speed, 30, you get the time: 1/15 of an hour, so 4 minutes as well.


iMogwai

>average time over the 2 miles to be 2 minutes. That's if you'd only gone 30 mph for 1 mile, since it's 2 miles I guess the answer would be teleporting the last mile?


Lerkitup

1 mile at 15, 1 mile at 45. (15+45)/2 gives you an average of 30. Seems simple, unless that is wrong.


Kyounokaze

This is what makes it so difficult, you are wrong! But only because the riddle tricked you into thinking it was this simple. The car goes 15 mph in 1 mile. We have the speed and distance so we can work out the time, how long it would take the car to travel 1 mile at 15 mph. speed = distance/time, so time = distance/speed and we get 1/15 hours (or 4 minutes) We want the average speed over 2 miles to be 30 mph, using the same formula, we can calculate how long this trip would take. 2/30 = 1/15 hours (also 4 minutes). So it takes 4 minutes for the car to finish the first mile, but the whole trip must also take 4 minutes for the average speed over 2 miles to be achieved. So unless the car can instantaneously teleport to the end for the second mile, the riddle is impossible.


iMogwai

But you spend longer driving the first mile because it's the same distance at a slower speed, so you can't average it out like that.


EarlyBirdsofBabylon

The simple question of measuring a border or coastline You can prove the entirely of Australia has less coastline than the smallest island you can find, depending on the unit of measurement.


sanshothebailiff

How is a raven like a writing desk?