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


Show me a random puzzle
 Most recent collections 

Advent calendar 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021