mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Dirty work

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?

Show answer & extension

Archive

Show me a random puzzle
 Most recent collections 

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2019