Pranav went to the bank at the speed of 60 kmph while returning for his home he covered the half of the distance at the speed of 10 kmph, but suddenly he realized that he was getting late so he increased the speed and reached the home by covering rest half of the distance at the speed of 30 kmph.The average speed of the Pranav in the whole length of journey is?
Answer with explanationAnswer: Option B
Distance between home and Bank – x km
Total distance = x + x = 2x
Total time taken = x/60 + (x/2)/10 + (x/2)/30
Average speed = 2x/(x/12) = 24 kmph