Answer
$5.73$ seconds
Work Step by Step
Number of pixels = $1280 \times 840 = 1075200$
Number of bits = $1075200 * 8\quad$ (8 bits per pixel)$=8601600$ bits
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Time taken = $\frac{number\space of\space bits}{speed\space in\space bits\space per\space second}$
=> Time taken = $\frac{8601600}{1500000}$
=> Time taken $\approx 5.73$ seconds
