JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr1 = [10, 10, 10],
    arr2 = [[7,3], [5,1,4], [5,5]],
    arr3 = [];

arr2.forEach((val, key) => {
	arr3[key] = [];
	val.forEach((val2) => {
  	arr3[key].push(val2 / arr1[key]);
  });   
});

console.log(arr3);