An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

What does this below rebus puzzle mean?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

what does this picture(rebus) riddle means ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?