From the question, we are told that Zia was driving his truck on the super highway and his speed was recorded by the motorway camera between 6:00am to 8:30am and that he covered a distance of 250km during this time.
Average speed is calculated as distance taken divided by the time used. The time used in this question will be: 8.30am - 6:00am = 2.5 hours.
do 8 times 25 to find out how much money your getting without the deduction of tax then find out how much ur tax is by cross multiplying, finally subtract that amount from ur total