|
Un article trouvé pour ce sujet.
 |
|
|
|
|
|
|
|
|
Joan and Jan work together |
2001-09-26 |
|
Karyna pose la question :
Joan and Jan work together and they set up a bandstand in just 24 minutes, but if Joan does it by herself she takes 1 hour. How long would it take Jan to set up the bandstand by himself?
Claude Tardif lui répond. |
|
|
|
