$$40\times(7+\frac{11}{60})$$
$\frac{862}{3}\approx 287.333333333$
$$40\left(\frac{420}{60}+\frac{11}{60}\right)$$
$$40\times \frac{420+11}{60}$$
$$40\times \frac{431}{60}$$
$$\frac{40\times 431}{60}$$
$$\frac{17240}{60}$$
$$\frac{862}{3}$$
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$\frac{2 \cdot 431}{3} = 287\frac{1}{3} = 287.3333333333333$