create travel calculator by using php, html, and css

How can we calculate how many days it will take to drive 1000 miles? 3000 miles? 10,000 miles? If you drive to Bellingham from Seattle, and it is 90 miles, how long will it take you? How do you know that? What additional variable must you declare?

My Travel Calculator Total miles driving? How fast do you typically drive? How many hours per day do you plan on driving? Price of gas $3.00$3.50$4.00 Fuel efficiency Hello Olga, you will be travelling a total of 20.00 hours, taking 4.00 days And, you will be using 100 gallons of gas, costing you $400 dollars