Show me a random puzzle
 Most recent collections 


sport shape trigonometry dice scales crossnumbers factors dodecagons arrows doubling proportion factorials mean probabilty 2d shapes chocolate time cryptic crossnumbers chalkdust crossnumber indices probability remainders cards polygons money coins perimeter star numbers averages means pascal's triangle quadratics division fractions addition ellipses floors lines routes coordinates partitions odd numbers dates clocks digits cryptic clues spheres colouring multiples wordplay sums functions calculus symmetry hexagons geometry shapes complex numbers speed grids sequences advent planes 3d shapes people maths prime numbers circles parabolas square roots regular shapes games square numbers differentiation unit fractions balancing bases logic integration numbers rectangles folding tube maps chess ave books irreducible numbers surds angles taxicab geometry menace perfect numbers cube numbers graphs triangles sum to infinity crosswords algebra christmas rugby volume percentages integers palindromes multiplication number triangle numbers area squares


Show me a random puzzle
▼ show ▼

2 December

In a week (Monday 12:01 to Monday 12:01 a week later), how many times will the minute hand of an analogue clock point in the same direction as the hour hand?

Show answer

Tags: clocks, time

Ticking clock

Is there a time of day when the hands of an analogue clock (one with a second hand that moves every second instead of moving continuously) will all be 120° apart?

Show answer & extension

Tags: angles, time

8! minutes

How many weeks are there in 8! (\(8\times 7\times 6\times 5\times 4\times 3\times 2\times 1\)) minutes?

Show answer & extension

Tags: numbers, time

Burning ropes

You have two ropes and some matches. Each rope, if lit at its end, will burn for 60 minutes. But the rate of burning is not regular, so cutting a rope in half doesn't result in a burn time of 30 minutes.
How can you use the ropes to time exactly 45 minutes?

Show answer & extension

Tags: time
© Matthew Scroggs 2019