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![\frac{d}{dt} (40 + 50 + 60 ) = \frac{d}{dt} (40 + 50 + 60 ) =](https://tex.z-dn.net/?f=+%5Cfrac%7Bd%7D%7Bdt%7D+%2840+%2B+50+%2B+60+%29+%3D+)
(40+50+60(
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Answer:
of which standard it is ?
anaghaverma:
the answer is 60
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