Sebuah kereta menempuh jarak 2000 km dalam waktu 5 jam. Berapakah kecepatan rata-rata kereta
Answer (3)
u need two equations. x + y = 125
0.60x + 0.30y = (0.36)(125)
x + y = 125 0.60x + 0.30y = 45
solve for a variable in the first equation y = 125 - x
plug into the second equation 0.60x + 0.30(125 - x) = 45 0.60x + 37.5 - 0.30x= 45 0.30x + 37.5 = 45 0.30x = 7.5 x = 25
plug the answer for x into the first equation 25 + y = 125 y = 100
To create 125 mL of a 36% hydrochloric acid solution, you need to mix 25 mL of 60% hydrochloric acid and 100 mL of 30% hydrochloric acid. This is based on setting up two equations to represent the total volume and the concentration of acid. Solving these equations gives the required volumes for each solution.
;
Jawaban:Kecepatan rata-rata = Jarak / Waktu Kecepatan rata-rata = 2000 km / 5 jam = 400 km/jam
