A time lapse camera takes pictures once every $40$ seconds. How many pictures does it take in a $24$ hour period? (Assume that it takes its first picture $40$ seconds after the start of the time period.)

2120

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2140

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2160

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2180

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Solution

The correct option is D 2160
$24$ hour $= 24 \times 60 \times 60 = 86400$ Second
$∵$ In every $40$ sec camera take 1 pic
$∴$ in $86400$ sec camera takes $=$ $\frac{86400}{40} = 2160$ pictures

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