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28) d = 60 liter/mnt
w = 1⅓ jam = 1⅓ × 60 = 80 mnt
v = d × w
= 60 liter/mnt × 80 mnt
= 4800 liter
= 4,8 m³ ( D )

29) L = π × r²
616 cm² = 22/7 × r²
616 × 7 = 22 × r²
4312 = 22r²
r² = 4312 ÷ 22
r = √196
r = 14 cm
d = 2 × 14 = 28 cm ( C )

30) V = ½ × Va × t
t = ( V × 2 ) ÷ Va
t = ( 2.160 × 2 ) ÷ 90
t = 4.320 ÷ 90
t = 48 cm ( D )