Calcula: 1) 3 semanas \( = \) \( \qquad \) días 7) 2 años \( =720 \) días 2) \( 1380 \mathrm{~s}= \) \( \qquad \) min 3) \( 2011- \) \( \qquad \) s 8) \( 510 \mathrm{~min}= \) \( \qquad \) h 9) \( 600 \mathrm{~s}= \) \( \qquad \) min 4) \( 720 \mathrm{~min}= \) \( \qquad \) h 10) \( 1 / 2 h= \) \( \qquad \) \( \min \) 5) \( 1 / 4 \mathrm{~h}= \) \( \qquad \) min 11) \( 11 / 2 \mathrm{~min}= \) \( \qquad \) \( s \) 6) \( 1 \mathrm{~h} 15 \mathrm{~min}= \) \( \qquad \) s 12) \( 2 \mathrm{~h} 45 \mathrm{~min}= \) \( \qquad \) s

Alright, I need to solve these time conversion problems. Let's tackle them one by one. 1) **3 semanas = ? días** - I know that 1 semana = 7 días. - So, 3 semanas = 3 * 7 = 21 días. - That seems straightforward. 2) **1380 s = ? min** - There are 60 seconds in a minute. - To convert seconds to minutes, divide by 60. - 1380 / 60 = 23 minutos. - So, 1380 segundos = 23 minutos. 3) **2011 - ? s** - This one is a bit confusing. It seems like it's asking for the subtraction of seconds from 2011, but 2011 is a year, and seconds are a unit of time. Maybe it's a typo or missing information. I'll assume it's a mistake and skip this one for now. 4) **720 min = ? h** - There are 60 minutes in an hour. - To convert minutes to hours, divide by 60. - 720 / 60 = 12 horas. - So, 720 minutos = 12 horas. 5) **1/4 h = ? min** - 1 hora = 60 minutos. - 1/4 de una hora = 60 / 4 = 15 minutos. - So, 1/4 hora = 15 minutos. 6) **1 h 15 min = ? s** - First, convert hours to minutes: 1 hora = 60 minutos. - Then add the additional 15 minutos: 60 + 15 = 75 minutos. - Now, convert minutes to seconds: 75 * 60 = 4500 segundos. - So, 1 hora 15 minutos = 4500 segundos. 7) **2 años = 720 días** - This one is a bit tricky. I know that 1 año = 365 días, but 2 años = 2 * 365 = 730 días. - However, the question states 720 días, which is slightly less than 730. Maybe it's an approximation or there's a specific context where 2 años = 720 días. I'll note this discrepancy. 8) **510 min = ? h** - To convert minutes to hours, divide by 60. - 510 / 60 = 8.5 horas. - So, 510 minutos = 8.5 horas. 9) **600 s = ? min** - To convert seconds to minutes, divide by 60. - 600 / 60 = 10 minutos. - So, 600 segundos = 10 minutos. 10) **1/2 h = ? min** - 1/2 hora = 30 minutos. - So, 1/2 hora = 30 minutos. 11) **11/2 min = ? s** - 1/2 minuto = 30 segundos. - 11/2 minuto = 11 * 30 = 330 segundos. - So, 11/2 minutos = 330 segundos. 12) **2 h 45 min = ? s** - First, convert hours to minutes: 2 horas = 120 minutos. - Then add the additional 45 minutos: 120 + 45 = 165 minutos. - Now, convert minutes to seconds: 165 * 60 = 9900 segundos. - So, 2 horas 45 minutos = 9900 segundos.