The thief was tired of the small change he was getting from the cashiers at the bank, so he broke in one night to raid the vault. When he got there, he came to a combination lock on the vault, with the dial numbers going from 0 to 59. Unfortunately, he wasn't sure whether there were three or four numbers in the combination, or even which direction to turn the wheel!(adsbygoogle = window.adsbygoogle || []).push({});

If it takes him 15 seconds to try a single combination, how many days will it take him to to try every possible combination? Please round to the nearest day.

I did this and got 1 Day. I want to make sure I got it right though. Can someone please check this, tell me if it's wrong, and explain how to do it? Here's my work...

3(First set of numbers) x 4(Second Set of Numbers) x 60 (0-59) x 8(# of possible turn cominations)=5760

=> 5760 x 15(Sec per Combination)=86400

Seconds per Day

60

x 60

----

3600

x 24

-----

86400

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Combination Problems

**Physics Forums | Science Articles, Homework Help, Discussion**