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 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020