For any work in excess of nine hours on any day or for more than 48 hours in any week, overtime wages are to be paid at the rate of double the wages. It is provided therein that where a worker is required to work beyond the normal hours of work or on any day of rest, he shall be entitled to wages at rate of twice his ordinary rate of wages in respect of the overtime work or work done on a day of rest, as the case may be.