ArchiveShow me a random puzzle
Most recent collections
Sunday Afternoon Maths LXVIIColoured weights
Not Roman numerals
Advent calendar 2018
Sunday Afternoon Maths LXVICryptic crossnumber #2
Sunday Afternoon Maths LXVCryptic crossnumber #1
Square and cube endings
List of all puzzles
Tagssport floors number wordplay area coins odd numbers integration surds addition chess squares remainders 3d shapes logic pascal's triangle perimeter factorials integers partitions functions division cryptic clues balancing ave perfect numbers money dates arrows planes square roots advent clocks sum to infinity numbers star numbers means coordinates algebra probabilty rugby triangle numbers crossnumbers christmas time colouring averages lines quadratics palindromes differentiation digits taxicab geometry multiplication trigonometry percentages bases irreducible numbers sequences routes doubling chalkdust crossnumber ellipses unit fractions triangles shapes games geometry menace regular shapes cube numbers dodecagons multiples graphs shape chocolate spheres crosswords symmetry proportion square numbers circles grids folding tube maps hexagons factors 2d shapes probability calculus dice indices scales people maths prime numbers polygons speed parabolas rectangles mean books cards angles fractions sums complex numbers cryptic crossnumbers volume
Source: Futilty Closet
Timothy, Urban, and Vincent are digging identical holes in a field.
When Timothy and Urban work together, they dig 1 hole in 4 days.
When Timothy and Vincent work together, they dig 1 hole in 3 days.
When Urban and Vincent work together, they dig 1 hole in 2 days.
Working alone, how long does it take Timothy to dig one hole?