A car originally planned to drive from place a to place B in 12 hours. If it reaches 1 / 3 of the total length, it will increase the original speed by 1 / 3 and finish the rest of the journey How many hours do you actually share to complete the whole journey?

A car originally planned to drive from place a to place B in 12 hours. If it reaches 1 / 3 of the total length, it will increase the original speed by 1 / 3 and finish the rest of the journey How many hours do you actually share to complete the whole journey?

The bus started from school and went to Taihu Lake. It took 34 hours to drive the whole journey in 67 hours. At this time, it was 4 kilometers away from Taihu Lake. At this speed, how many hours did it take to complete the whole journey?

It takes 87 hours to complete the whole journey

How many hours does it take for a car to travel from place a to place B in three hours? (in proportion) it must be used

It takes x hours to complete the whole process
3:x=1/4:1
x=12