You may also like

problem icon

Building Tetrahedra

Can you make a tetrahedron whose faces all have the same perimeter?

problem icon

Ladder and Cube

A 1 metre cube has one face on the ground and one face against a wall. A 4 metre ladder leans against the wall and just touches the cube. How high is the top of the ladder above the ground?

problem icon

Bendy Quad

Four rods are hinged at their ends to form a convex quadrilateral. Investigate the different shapes that the quadrilateral can take. Be patient this problem may be slow to load.

Petrol Stop

Age 14 to 16 Short Challenge Level:

Roberto drove a total distance of 250 km.
The whole journey took him 3 hours, including a 20 minute stop to get petrol.
Before he stopped for petrol, his average speed was 80 km per hour.
After his petrol stop, his average speed was 100 km per hour.

How long did Roberto drive for after his petrol stop?

This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.