i need the answer for e Half an hour after leaving her house

i need the answer for (e)

Half an hour after leaving her house Beverly was 30 miles from home. At this point she merged onto the highway and was traveling at a constant speed for the next several hours. Four hours after leaving her house Beverly was 200 miles from home. a. How far did Beverly travel in 1 hour while traveling at a constant speed? 48.57142857 miles b. How far did Beverly travel in 0.25 hours while traveling at a constant speed? miles c. How far did Beverly travel in 1.85 hours while traveling at a constant speed? miles d. How long did it take Beverly to travel 35 miles while traveling at a constant speed? hours e. How long did it take Beverly to travel 1 mile while traveling at a constant speed? hours

Solution

Let Constant speed be x miles/hr

Distance travelled with constant speee = 200-30 = 170 miles

time taken = 4-1/2 = 7/2 hr

Speed = 170/(7/2) = 340/7 miles/hr

Time taken to travel 1 mile = 7/340 hr