self Maths Puzzle

A BOY GOES TO SCHOOL WITH THE SPEED OF 3KM/HR AND RETURNS WITH THE SPEED OF 2 KM/HR.IF HE TAKES 5 HOURS IN ALL THEN THE DISTANCE IN KM BETWEEN THE VILLAGE AND SCHOOL IS:

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self Other Question

Opaque Cube
You are making an opaque cube (ie you cannot see through its sides).

It can be any size that you want it to be.

Where do you place the cube so that you can see as many sides as possible?
If we multiply the digits of a number until we get a single digit, then which is the only two digit number which require multiplication of digits more than 3 times?