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A line between stations $P$ and $Q$ laid on a slope of $1$ in $5$ was measured as $350\; m$ using a $50\; m$ tape. The tape is known to be shortly by $0.1\; m$.

The corrected horizontal length (in $m$) of the line $\text{PQ}$ will be

  1. $342.52$
  2. $349.30$
  3. $356.20$
  4. $350.70$
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