Wang Hua listened for 90 minutes. Subtract 90 minutes from 15: 20 to get 13: 50.
2
A calls 1/6 every hour.
I dial110 every hour.
B gives 7/ 10, and A gives 3/ 10.
A It took 3/10/(1/6) =1.8 hours.
three
It is 7x long and 4x wide.
7x-4x= 12
x=4
Chang 28
Width 16
four
The ratio of arrival speed to departure speed is 7: 6.
The time ratio is 6: 7.
It took 52*6/ 13=24 minutes to arrive.
Distance 24*70= 1680m.
Summary of moral education in the first grade of primary school 1
The purpose of reflective education in the sem