Bank Wait Times

Suppose a small bank has one teller and customer transactions take 10 minutes on average. With 5.8 customers arriving per hour, what is the expected wait time? What would it be if you added a second teller?

With one teller, customers will wait nearly five hours on average. But adding a second teller makes the wait go down to 3 minutes.

Thanks to John D. Cook for this one.

Posted in Brain Teasers

A Metal Roof and a Glass Wall

I have a metal roof and a glass wall,
I burn and burn but never fall.

What am I?

A lantern.

Posted in Riddles
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Everyone Has It

Everyone has it.
Those who have it least don’t know that they have it.
Those who have it most wish they had less of it,
but not too little or none at all.

Age. Young children don’t even know their age and extremely old folks wish they could turn back the hands of time, but not so much that they’re too young or they no longer have an age at all.

By Sef Daystrom

Posted in Riddles

Mystical Rock Group

What rock group has four men that don’t sing?

Mount Rushmore.

Posted in Riddles

Mountain Covered With Snow

Why doesn’t a mountain covered with snow catch cold?

Because it has a snowcap. ;) I know, it was more joke than riddle, but I found it amusing.

Posted in Riddles

Two In A Whole And Four In A Pair

Two in a whole and four in a pair
And six in a trio you see
And eight’s a quartet but what you must get
Is the name that fits just one of me?

A half.

Posted in Riddles

It Never Lasts Forever

You can have it
and be at it,
but it never
lasts forever.

Peace.

By Sef Daystrom

Posted in Riddles

Far Blow Bacon

What do the following words have in common?

far
blow
bacon
lather
fasting
wariness
pacemaker

Each of these words becomes a new word when the letter ‘e’ is placed after the first letter.

far = fear
blow = below
bacon = beacon
lather = leather
fasting = feasting
wariness = weariness
pacemaker = peacemaker

Posted in Brain Teasers

Marcus’ Strange Age

Marcus was 15 years old in 2010. In 2015 he was only 10 years old. How is this possible?

The years are B.C., so 2015 came before 2010.

Posted in Brain Teasers

Always Done On Purpose

Of all the things that are broken,
this makes the least noise
and is always done on purpose.

Bread.

By Sef Daystrom

Posted in Riddles