I suggest you convert everything to the same unit - in this case probably miles per hour would be easiest - then you can easily compare. To get the speed in miles per hour, just divide the number of miles by the number of hours.
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There are 5280 feet in one mile. Therefore, travelling 24 miles per hour is the same as travelling 24 x 5280 = 126720 feet per hour. There are 3600 seconds in one hour. Therefore, travelling 126720 feet per hour is equivalent to travelling 126720/3600 = 35.2 feet per second.
If you travel 60 mph, you can go 798 miles in 13 hours, 18 minutes. Faster shorter, slower longer.
There are 5280 feet in one mile. Therefore, 24 miles is equal to 5280 x 24 = 126720 feet.
After 1 hour the slower car will be 30 mph x 1 hour = 30 miles ahead of the faster car. The faster car is travelling 45 mph - 30 mph = 15 mph faster than the slower car and so will cover this 30 miles in 30 miles ÷ 15 mph = 2 hours at which point it will have caught the slower car and start to over take it.
We know that the time traveled is 5 hours, since a car going 10 mph faster travels an extra 50 miles over the same amount of time.Dividing 300 miles by 5 hours, we get 60 mph. Since the car is traveling 10 mph, the car is traveling 70 mph.