How to draw the ninth question on page 12 of the first volume of the mathematics textbook for the sixth grade of primary school?

You can divide 2/3 hours into several minutes first:

2/3X60=40 minutes.

The experiment time accounts for 3/5, that is to say, the whole class time of 40 minutes is divided into 5 equal parts, and the experiment accounts for 3 of them.

In this way, a class of 40 minutes is regarded as'1',which is represented by a long line segment, and then this line segment is divided into five segments on average, three of which are experimental time.

40 x 3/5 = 24 minutes.

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