3-point question ( of )

Which of the following driving schedules is permissible?

  1. "2 hours of driving, 10 minutes break; 2.5 hours of driving, 35 minutes break."
  2. "2 hours of driving, 15 minutes break; 2.5 hours of driving, 15 minutes break."
  3. "2 hours of driving, 15 minutes break; 2.5 hours of driving, 30 minutes break."