problem
Favourite
Take a message soldier
Age
14 to 18
Challenge level
A messenger runs from the rear to the head of a marching column and
back. When he gets back, the rear is where the head was when he set
off. What is the ratio of his speed to that of the column?
problem
Mach attack
Age
16 to 18
Challenge level
Have you got the Mach knack? Discover the mathematics behind
exceeding the sound barrier.
problem
Bike
Age
16 to 18
Challenge level
Calculate the paths of raindrops flying up from the back tyre of a bicycle
