tolong dijawab nomor tigapuluhtiga (eh btw kok poin uda gabisa 5 lagi ya, ish abis dah poin saya.)

Dik : s1 = 120
s2 = 40
v1 = v2 = 320

t1 = s1/v1
t1 = 120/320 = 3/8

t2 = s2/v2
t2 = 40/320 = 1/8

Selisih t = 3/8 - 1/8 
= 2/8 = 0,25 s (D)

V = s/t
t = s/v
t1 = s1/v
t1 = 120/320
t1 = 3/8 s

t2 = s2/v
t2 = 40/320
t2 = 1/8

t1-t2 = 3/8 - 1/8
t1-t2 = 2/8 = 1/4 = 0,25 s
Jawabannya d. 0,25 s

Ket : t1 --》waktu bunyi pantul 1
t2 --》 waktu bunyi pantul 2