Li Ming imitates Wei Zi video.

Zhang Hua and Li Ming do their math homework at the same time. Zhang Hua finished with 1/5, and Li Ming finished with 1/4. Who does it faster? To calculate the formula,

1 hour =60 minutes;

60* 1/5= 12 (minutes);

60* 1/4= 15 (minutes);

So Zhang Hua did it soon.