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# A bicycle rider coasts down the hill, travelling 4ft in the

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A bicycle rider coasts down the hill, travelling 4ft in the [#permalink]  03 Jul 2003, 07:36
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A bicycle rider coasts down the hill, travelling 4ft in the first second. In each succeeding second, he travels 5ft farther than in the preceeding second. If the rider reaches the bottom of the hill in 11 seconds, find the total distance travelled.
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Brainless

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1 second = 4 feet
2 second = 4+5 feet
3 second = 4+5+5 feet

N second = 4+5(n-1)

11 second = 54

The sum of ariphmetic progression is (4+54)*11/2=319
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