Помогите решить загадку.

Mike's father asked him to cut the grass of the square field behind their house. It took Mike 90 minutes to do the left side, 90 minutes to do the top and 90 minutes to do the right side. But it took him 1 hour and a half to do the bottom. Why?


Ответы и объяснения


because 90 minutes is 1 hour and a half, so he spent the same time on each of the sides.

(90 мин=1ч 30мин, если по русски)