Question 6a:
Volume of the sand = 1/3π(10)²(25) = 2618 cm³
Answer: 2618 cm³
Question 6b:
2618 cm³ = 1 hour
2618 cm³ = 60 mins
2618 cm³ = 3600 seconds
0.73 cm³ = 1 second
Answer: 0.73 cm³/s
Question 7a:
Volume = (1 x 10 x 10) + 1/2(1 + 2) x 10 x 10 = 100 + 150 = 250 m³
Answer: 250 m³
Question 7b:
250 m³ = 250 kl
1 kl = $1.98
250kl = $1.98 x 250 = $487.50
Answer: $487.50