Respuesta :

capsasha2

Answer:

540 seconds

Step-by-step explanation:

  1. 15 min = 900 seconds
  2. Plug 900 in: Blinked 85 times in 900 seconds
  3. Set up a proportion: [tex]\frac{85}{900} = \frac{51}{x}[/tex]  
  4. Cross multiply, then divide: 900 × 51 = 45900, 45900 ÷ 85 = 540 seconds

I hope this helps!