tolong di bantu lumayan sulit

[tex]e = \frac{63.5}{2} = 31.75 \\ m = \frac{e.i.t}{96500} \\ 3.175 \times 96500 = 31.75 \times2 \times t \\ \frac{306387.5}{63.5} = t \\ t = 4.825[/tex]
jawabannya C.