We are given
Andre rode his bike at a constant speed he rode 1 mile in 5 minutes
Firstly, we will find constant speed
In 5 minutes , distance travelled =1 miles
so, we get speed

Let's assume T is time in minutes
D is the distance in miles
we know that

so, we can plug value
and we get

so, we get
...............Answer
(1 + x) (13) = 13+6.5
13x + 13 = 19.5
13x = 6.5
x = 0.5
The item was marked up by 50%
5.6mile
7 x
-- = --
80 64
7×64=80x
448=80x
x=5.6
5,695= 67x85 that's the answer