Sorting cars in line

There are $25$ cars stored in a straight line-shaped garage and are numbered $25, 24, 23, ..., 3, 2, 1$ in that order. You want to rearrange them in the reverse order $1, 2, 3, \cdots, 23, 24, 25$ . You are allowed to switch only any two adjacent cars at a time. To switch two adjacent cars, you need $2$ drivers to do so. Assume that there are $10$ drivers and the average time required to switch two adjacent cars is $1$ minute. What is the minimum time required to do this job?

* Assume that there is enough space for the 10 drivers to drive and move cars. *