+103 at a sports day the school pupils participated and in a conetst, which was made out of 3 courses : runing,bicycle riding and swiming. the leangth of the swiming cours course was 20% of the leangth of the riding course.the runing course leangth was 1/5 of the swiming course. the combined leangth of all of those 3 courses was 62km. what was the leangth of each course?
+33661 Let r = length of riding course, s = length of swimming course and n = length of running course.
Then s = 0.2r and n = s/5 = 0.2r/5 so total length = r + 0.2r + 0.2r/5 = 1.24r
This equals 62km so 1.24r = 62; r = 62/1.24 or:
r = 50 km
s = 0.2r = 10km
n = s/5 = 2km
