In the context of accuracy of measurement and significant figures in expressing results of exper...

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In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct
(a) Out of the two measurements \( 50.14 \mathrm{~cm} \) and \( 0.00025 \) ampere, the first one has greater accuracy.
(b) If one travels \( 478 \mathrm{~km} \) by rail and \( 397 \mathrm{~m} \) by road, the total distance travelled is \( 478 \mathrm{~km} \).
(1) Only (a) is correct
(2) Only (b) is correct
(3) Both are correct
(4) None of them is correct
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