Cats & mice

[kate]

Three cats eat three mice for hour and a half:
a) what is the time in which a cat eats one mouse;
b) for how much time will 10 cats eat 10 mice;
c) for how much time will 10 cats eat 20 mice?

[Jonasmathwork]

Solution: Given 3 cats eat three mice for hour and a half
a) 1 cat eat 1 mice in 10 min
b) 10 cat eat 10 mice in 10*10
=100 min
=1 hour 40 min