what is his average speed
2007-02-15 11:27:55 · 3 answers · asked by Sarah M 1 in Sports ➔ Cycling
What still here? Doesn't (_)iiiiD's answer do it for you? It is correct you know.
Oh I get it you want the working also.
20/s= t.....and....20/(s+4) = t-1
20=(20/s-1)(s+4)
s=80/s - 4
S(squared) + 4s-80 = 0 (Quadratic equation)
s = (-4 +sqr root (16+320)/2
s = (_)iiiiD's answer
David is quite a poor rider. He would benefit form a more time in the saddle.
You should post this sort of question in the mathematics category. We like to show off, but prefer cycling questions.
2007-02-18 11:24:35 · answer #1 · answered by Glenn B 7 · 0⤊ 0⤋
7.16515138991166 mph exactly
2:47:28.6362509205404 hrs to go 20 miles at that speed
1:47:28.6362509205404 hrs to go 20 miles at 11.16515138991166mph
tell your teacher to suck it
2007-02-15 22:58:12 · answer #2 · answered by (_)iiiiD 4 · 1⤊ 0⤋
his average speed is 16 miles an hour
2007-02-15 19:33:40 · answer #3 · answered by ben dovah 1 · 0⤊ 3⤋