Hello i was doing a math problem and i was wondering if this is correct

yes it is correct!

Step-by-step explanation:

Given number : travelling 45 miles /hours
Find the number of minutes will you spend if you travel 240 miles from Orlando to Miami
=> in 1 hour there are 60 minutes
=> 45 miles / hours is also equals to 45 miles / 60 minutes
=> how many 45 are their in 240
=> 240 / 45
=> 5.3, round to the nearest whole number = 5
=> 5 x 60
=> 300 minutes
=> 240 /300 minutes