mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Colliding parallel people

If two people stand 1km apart and walk in the same direction, how far will the have to walk until they collide due to the curvature of the Earth? (diameter of Earth = 12,742km)

Show answer & extension

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

odd numbers spheres christmas parabolas median surds books digital products perfect numbers complex numbers factors addition chess ellipses rectangles proportion regular shapes perimeter cryptic crossnumbers chocolate dodecagons area speed cards rugby chalkdust crossnumber menace range trigonometry shape prime numbers percentages tiling square roots matrices folding tube maps dominos coordinates graphs cube numbers pascal's triangle mean polynomials logic sums planes sum to infinity differentiation means crosswords neighbours squares calculus balancing algebra geometric mean scales coins numbers people maths doubling averages triangles palindromes unit fractions polygons irreducible numbers volume cubics indices consecutive integers dice games symmetry shapes decahedra fractions taxicab geometry gerrymandering wordplay digits probability integers square grids pentagons dates angles ave tournaments integration digital clocks triangle numbers grids tangents quadratics partitions combinatorics determinants factorials arrows elections axes albgebra medians 2d shapes multiplication geometry floors advent consecutive numbers expansions quadrilaterals numbers grids even numbers 3d shapes powers probabilty products functions multiples money cryptic clues routes hexagons colouring time sequences lines crossnumbers number remainders sets star numbers clocks the only crossnumber division circles binary square numbers bases geometric means sport

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025