tolong bantu jawab pliseeee

1. Luas =1/2 x ( a +b) x t
Luas = 1/2 x (9+3) x 3
Luas = 1/2 x 12 x3
Luas = 18 petak satuan

2. V = p x l xt
= 12 x 10 x 8
= 960 cm3

3. V = s/t
V = 200 : 5/2
V = 200 x 2/5
V = 80 km/jam