Morning

Jana rose in the morning in the quarter to seven. She slept nine and a half hours. When did she go to sleep?

Result

t = 21:15 hh:mm

Step-by-step explanation:

$$\begin{gathered} t_1=6+3\mathrm{/}4={\displaystyle \frac{27}{4}}=6.75\text{ h } \\ {t}_2=9+1\mathrm{/}2={\displaystyle \frac{19}{2}}=9.5\text{ h } \\ {t}_3=t_1-t_2=6.75-9.5=-{\displaystyle \frac{11}{4}}=-2.75 \\ t=t_3+24=(-2.75)+24=21.25=21:15\text{ hh}:\text{mm} \end{gathered}$$

Try another example

Related math problems and questions:

• Cats sleep
  Cats sleep for 11 hours in a 24-hour day. How many hours a day is a cat awake?
• Nightingale
  Nightingale sang five seconds for 5 hours and 5 minutes. How many seconds were missing to sing 10 hours?
• Look at
  Look at the time on the clock now. Information The short hour hand is between 9 and 10. The long minute hand points to 5. Question Second-graders go to recess in 15 minutes. What time will it be then?
• Weeks
  38 weeks is equal to how many days?
• Television
  When we add to the difference between the numbers 1704 and 654 the difference numbers 14920 and 14042, we get a year in which television was invented. How many years have people known the TV?
• Theatre
  The theatrical performance started at 15:50 and ended at 18:50. How many minutes long?
• Workshop
  In the workshop have to be produced for 5 days 2000 components. How many components must be produced in the workshop every day and how much per hour, if shift is 8 hours.
• Hours
  How many hours is 9 days?
• Add symbols
  Add marks (+, -, *, /, brackets) to fullfill equations 1 3 6 5 = 10 This is for the 4th grade of the primary school - with no negative numbers yet
• Numbers
  By how many is the difference of numbers 8 and 34 less than its product?
• Pimps
  There were 24 pimps in the plate. Maros ate 12, his little sister four times less. How many pimps remained in the plate?
• Tourist
  Tourist went 24 km for 4 hours. How many meters he goes at the same speed for 12 minutes? ... Help - convert units to minutes and meters
• Infants water
  The tank, which has 10 hectoliters of water for infants, went 580 liters in the morning and 340 liters in the afternoon. How many liters left in the tank?
• Fw and back
  On a Sunday morning, Gabriel jogged 10 blocks from his house and then he decided to go back 4 blocks, by the same road. How many blocks away is he from his house?
• Bus driver
  The bus driver rides 174 km in the morning, afternoon rides 26 km more. How many kilometers traveled in 5 days if he rides on the same line?
• Cyclist
  A cyclist passes 88 km in 4 hours. How many kilometers did he pass in 8 hours?
• Expression 8
  Evaluate this expressions: a) 5[3 + 4(2.8 - 3)] b) 5×(8-4)÷4-2