Monday, April 14, 2008

Tough Interview Question #48: Move A Safe

To move a Safe, two cylindrical steel bars 7 inches in diameter are used as rollers.
How far will the safe have moved forward when the rollers have made one revolution?


The safe must have moved 22 inches forward.
If the rollers make one revolution, the safe will move the distance equal to the circumference of the roller. Hence, the distance covered by the safe is
= PI * Diameter (or 2 * PI * Radius)
= PI * 7
= 3.14159265 * 7
= 21.99115
= 22 inches approx

Jeff Altman 
The Big Game Hunter
www.TheBigGameHunter.us
JeffAltman@TheBigGameHunter.us

© 2008 all rights reserved.

1 comment:

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