Answer:
0(? lol)
s = d/t, d = 90, t = 20
s = 90/20
s = 4.5m/s
≈ 4 ½m/s
1. d = st, s = 120, t = 5
d = (120)(5)
d = 600km
2. t = d/s, s = 7.6, d = 15
t = 15/7.6
t = 1.973684211mins.
≈ 2mins.
3. s = d/t, t = 45, d = 90
s = 90/45
s = 2m/s
4. t = d/s, d = 139, s = 13
t = 139/13
t = 10.69230769sec.
≈ 10.7sec.
Hope this helps. ^^
