Noma’lum dan repost
x+y/x-y= 3/2
x:y=5k:k (5k=M/20+2.5km/h)
M-80/4k+ M-80/6k= M/60
3M-240+2M-160/12k=M/10
50M-4000 = 12M(k+50/100)
5000M-400000 = 12M^2+600M
3M^2-1100M+10,00,00
3M^2-600M-500M+10,00,00
3M(M-200) - 500(M-200
M=200 , M= 500/3
M >180
M= 200
5k= 200/20+2.5= 2.5km/h✔️
13N*6/5 = 2D/(7N/6)
10D= 13N*7N
13N= 2D/(2N-3)
13N(2N-3) = 13N*7N/5
10N-15 = 7N
13N= 65km/h✔️