**One-fifth of a journey is covered at a speed of 30 km/h, one-fourth of the journey at a speed of 25 km/h and the rest at 60 km/h. What is the average speed (in km/h, correct to one decimal place) for the whole journey?** A) 30.6 B) 40.5 C) 25.4 D) 38.7 Click Link for Answer