JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<form>
		<label for="placa">Placa:</label>
		<input type="text" class="placa">

		<label for="concessionaria">Concessionaria:</label>
		<input type="text" name="concessionaria" id="concessionaria">
</form>
<form>
		<label for="placa">Placa:</label>
		<input type="text" class="placa">

		<label for="concessionaria">Concessionaria:</label>
		<input type="text" name="concessionaria" id="concessionaria">
</form>
<form>
		<label for="placa">Placa:</label>
		<input type="text" class="placa">

		<label for="concessionaria">Concessionaria:</label>
		<input type="text" name="concessionaria" id="concessionaria">
</form>

JavaScript

$(".placa").on('input', function() {
	$(this).parent().find('#concessionaria').val($(this).val());
});