December 30, 2009

Tick Tock

Filed under: Google Interview Questions — Jonathan @ 10:33 am

How many times a day does a clock’s hands overlap?


December 15, 2009

Crossing the bridge.

Filed under: Google Interview Questions, Math — Jonathan @ 10:51 am

Four people need to cross a rickety rope bridge to get back to their camp at night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. Each of the campers walks at a different speed. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slow poke takes 10 minutes to cross. How do the campers make it across in 17 minutes?

Solution in comments.

Blog at