Questions

Averaging Speed Camera

A pair of averaging speed cameras are 2 miles apart on a 70mph road, and you do 35mph for the first mile to an obstruction.

What maximum speed can you do before reaching the next camera ?

Clue the answer is not 105mph.

 

Ball Bearing Weighing

You have 9 ball bearing, however one of the ball bearings is made from a lighter material. You have a balance scale to compare weights of objects on. The scales are not calibrated and you have no other equipment.

What is the minimum number of weighing's you have to perform to find the light weight ball ?

Clue the answer is less than 3 tries.