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http://www.askphysics.com/a-body-covers-a-distance-of-20-m-in-7th-sec-and-24-m-in-the-9th-sec-how-much-shall-it-cover-in-15s/
A body covers a distance of 20 m in 7th sec and 24 m in the 9th sec. How much shall it cover in 15s ?