Given this data set, find the average time travel between indacted mile markers

Question

Given this data set, find the average time travel between indacted mile markers 10 to 15 in min.

I have the answer for the first three 7.69 7.50 6.52
ta for Red Diamond Rd., Mile Markers 10.00 to 15.00, First Quarter, 2014. Avg. Travel Time Between 14 Indicated Total Average weekday Average Mile Day of Daily Speed or Cars Markers Date Week Traffic (mph) Weekend per Hour (min) 8 1/1/2014 Wednesday 12,155 39 Weekday 506.458333 9 1/2/2014 Thursday 9,680 40 Weekday 403.333333 1/3/2014 Friday 10,450 46 Weekday 435.416667 43 Weekend 206.25 1 1/4/2014 Saturday 4,950 2 1/5/2014 Sunday 4,675 47 Weekend 194.791667 3 1/6/2014 Monday 11,880 45 Weekday 495 40 Weekday 343.75 4 1/7/2014 Tuesday 8,250 11,050 36 Weekday 460.416667 5 1/8/2014 Wednesday in a Ex01 Ex 02 Aver Aver Aver Aver Aver

Explanation / Answer

Here The mile markers are placed in between 10 miles and 15 miles.

So distance d = 15-10 = 5 miles

The speed for first row is v = 39 mph

The average travel time is

t = d/v = 5/39 = 0.128 hrs = 7.69 min

b) for second row , t= 5*60/40 = 300/40 = 7.5 min

c) for third row t = 300/46 = 6.52min

so the simple mathematical formula is t = 300/average speed

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