[рони]

TimohaP,

function a(d) {
    return d.reduce(function(b, c) {
        return Math.abs(b[0] - b[1]) > Math.abs(c[0] - c[1]) ? b : c
    })
};

alert(a([ [1,60], [58,60] ]))
alert(a([ [1,2],[8,9],[1,5]]))