Pankaj went to the post office to the speed of 60km/hr while returning for his home he covered the half of the distance at the speed of 10 km/hr but suddenly he realized that he was getting late so he increased the speed and reached the home by covering the rest half of the distance of the speed of 30km/hr The average speed of the pankaj in the whole length of the journey is:

Options

A. A) 5.67 km/hr
B. B) 24 km/hr
C. C) 22.88 km/hr
D. D) 5.45 km/hr

Answer

B