In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct
$(1)$ Out of the two measurements $50.14 \,cm$ and $0.00025$ ampere, the first one has greater accuracy
$(2)$ If one travels $478\, km$ by rail and $397\, m$. by road, the total distance travelled is $478\, km.$
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