Discussion
A line AB between the stations A and B was measured as 348.28 m using a 20 m tape, too short by 0.05 m. The correct length of AB is:
Answer: D
The correct length of AB is 347.4 m.
A tape that is too short reads more than the true distance, because each 'tape length' laid down actually covers only 19.95 m:
\[ \begin{aligned} L &= \frac{L'}{L_n} \times l' = 348.28 \times \frac{19.95}{20} \\ &= 347.41\ \text{m} \end{aligned} \]
So the true length is a little less than the measured one. The other options are far from 348.28 m, while a 0.05 m error per 20 m can change the length by less than 1 m, so none of them can be right.
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