Problema Solution
A jogger ran 3 miles then decreased her speed by 1mph and ran 4miles. Her total time was 1 3/4 hours.Find her speed for each part of the run. Let x = the speed for the first 3 miles.
Answer provided by our tutors
total time tAKEN = 13/4 hrs
let x = initial speed
and it travell 3 mile in this speed
then travelled 4 miles in x -1 speed
so total distance covered = 3 +4 = 7 miles
total time taken = 13/4 hrs
so
s = d/t
t = d/s
so
13/4 = 3/x + 4 / x-1
=> x = 2.2 miles / hrs
so x - 1 = 1.2 miles /hrs answer