You can do this!
How many MPH is (D) 240 miles in 6 hours = 240 / 6?
How about (C) 240 miles in 5 hours = 240 / 5
At 60 Miles per hour you go 60 miles every hour. So how many miles would you travel in (A) 6 hours = 6 X 60?
What about (B) 5 hours = 5 X 60?