Basic Puzzles Harder Puzzles Sticks, Coins & More... Funny Riddles & Puzzle Jokes Mathematical Problems Harder Mathematical Problems Logical Puzzles Brainteasers Complex Problems Brain Tests & Experiments Quizzes
A short introduction Cookie policy Links

Solution to: Speedy Sums

Let the distance between the stations of Utrecht and Amersfoort be d km. The four minutes delay is 4/60 part of an hour. Now the following holds:

d / 90 + 4/60 = d / 70.

Solving this equation gives d=21, so the distance between the stations of Utrecht and Amersfoort is 21 km.


Back to the puzzle
This website uses cookies. By further use of this website, or by clicking on 'Continue', you give permission for the use of cookies. If you want more information, look at our cookie policy.