4. How many seconds are there in $\frac{1}{4}$ of $\frac{1}{6}$ of $\frac{1}{8}$ of a day?
A 60
B 120
C 450
D 900
E 3600
4. C One day contains 24 hours. Hence $\frac{1}{8}$ of a day is three hours and $\frac{1}{6}$ of this is half an hour. Half an hour contains $\left(\frac{1}{2} \times 60 \times 60\right)$ seconds $=1800$ seconds and $\frac{1}{4}$ of this is 450 seconds. Hence there are 450 seconds in the required fraction of a day.