$$(28/10/24)-(1/7/24)$$
$\frac{31}{280}\approx 0.110714286$
$$\frac{28}{10\times 24}-\frac{\frac{1}{7}}{24}$$
$$\frac{28}{240}-\frac{\frac{1}{7}}{24}$$
$$\frac{7}{60}-\frac{\frac{1}{7}}{24}$$
$$\frac{7}{60}-\frac{1}{7\times 24}$$
$$\frac{7}{60}-\frac{1}{168}$$
$$\frac{98}{840}-\frac{5}{840}$$
$$\frac{98-5}{840}$$
$$\frac{93}{840}$$
$$\frac{31}{280}$$
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$\frac{31}{2 ^ {3} \cdot 5 \cdot 7} = 0.11071428571428571$
