mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Superdog

A dog is running along a beach at 2m/s. The dog's owner blow a whistle every 10 seconds. Each time the dog hears a whistle, she doubles her speed. How many whistles will the dog hear?
(Hint: speed of sound = 343m/s)
(Hint 2: The answer is not eight!)

Show answer & extension

Tags: speed

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

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

Archive

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