1003034506

SubArea: 
Systems of linear equations and inequalities
Level: 
B
Project ID: 
1003034506
Source Problem: 
2010011204
Accepted: 
1
Clonable: 
1
Easy: 
0
Kamil is able to mow a meadow in 12 hours. Zdeněk has a better lawn mower and he is able to mow the same meadow in 8 hours. They have agreed that Kamil starts to mow alone sooner and Zdeněk will join him later so that the total time of mowing is 9 hours. How long will they mow together?
2 hours
7 hours
6 hours
3 hours