**Two-thirds of a certain distance was covered at the speed of 45 km/h, one-fourth at the speed of 60 km/h and the rest at the speed of 75 km/h. Find the average speed per hour for the whole journey. (correct to 2 decimal places)** A) 58.25 km/h B) 45.75 km/h C) 51.25 km/h D) 49.77 km/h Click Link for Answer