First, subtract 5 from both sides of the equation to get
1.7 = 2.5 sin(30t) Now divide both sides by 2.5
.68 = sin(30t) now use the arcsin fxn to get
42.84 = 30t Now divide both sides by 30
1.428 = t
Your next post gives more information ..... t is in hours 1.428 hours 1 hour 25 minutes 40.8 seconds