Riddle #233

I move very fast

Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers, magazines and journals. What am I?
Particles.
92.46 %
33 votes

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Train's length

A 400 yard long train, travelling at 30 mph, enters a 4.5 mile long tunnel. How long will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?
9 minutes and 27.2727 seconds.
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Odd number

I am an odd number; take away an alphabet and I become even. What number am I?
7.
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What am I?

I am pronounced as a one letter alphabet I am written with three letters I am complete with just two letters I am double I am blue I am black I am brown I am gray I am yellow and I am green I can read from both ends I appear the same every way! What am I?
Eye.
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Number of Fs

Count the number of times the letter "F" appears in the following paragraph: FAY FRIED FIFTY POUNDS OF SALTED FISH AND THREE POUNDS OF DRY FENNEL FOR DINNER FOR FORTY MEMBERS OF HER FATHER'S FAMILY.
It appears 14 times. Make sure to count the "F"s in the word "OF", which people commonly miss.
89.07 %
38 votes

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Who Am I ?

I am a 5 letter word. Take away the first letter and I am a place's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?
Woman, oman, man.
74.45 %
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Maths logical problem

The digits 0-9(0,1,2,3,4,5,6,7,8,9) can be rearranged into 3628800 distinct 10 digits numbers. How many of these numbers are prime?
None. The sum of numbers from 0-9(0,1,2,3,4,5,6,7,8,9) is 45 and therefore can be divisible by 3 and 9.
85.67 %
39 votes