Question

Tolong beri penjelasanya yah

Answer 1

43. (2x - y)/(x + y) = 5/7
7(2x - y) = 5(x + y)
14x - 7y = 5x + 5y
14x - 5x = 5y + 7y
9x = 12y
x/y = 12/9
x/y = 4/3
x : y = 4 : 3

Jawaban: B

44. s1 = s2
v1 . t1 = v2 . t2
40 . 5 jam 15 menit = 60 . t2
40 . 5 1/4 jam = 60 . t2
40 . 21/4 = 60 . t2
210 = 60 . t2
t2 = 210 : 60
t2 = 21/6 jam = 3 3/6 jam = 3 jam 30 menit

Jawaban: B