# 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

#### Solution:

$t_{1}=6 + 3/4=\dfrac{ 27 }{ 4 }=6.75 \ \text{h} \ \\ t_{2}=9 + 1/2=\dfrac{ 19 }{ 2 }=9.5 \ \text{h} \ \\ \ \\ t_{3}=t_{1} - t_{2}=6.75 - 9.5=- \dfrac{ 11 }{ 4 }=-2.75 \ \\ \ \\ \ \\ t=t_{3} + 24=(-2.75) + 24=\dfrac{ 85 }{ 4 }=21.25=21:15 \ \text{hh}:\text{mm}$

Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

Tips to related online calculators
Do you want to convert time units like minutes to seconds?

## Next similar math problems:

1. Nightingale
Nightingale sang five seconds for 5 hours and 5 minutes. How many seconds were missing to sing 10 hours?
2. Clock
How many hours are 15 days?
3. Hours
How many hours is 9 days?
4. Euro
I have 1 euro. How much will I have when you spend it on?
5. 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 people known the TV?
6. Book
Jitka read on holidays book that has 180 pages. In the first week read 45 pages. In the second week she read 15 pages more than the first week. How many pages left to read it yet?
7. Baking
There are 28 bunches, and son ate 1/2, dad ate four bunches. How many of them remain on the baking dishes?
8. Theatre
Theatrical performance started at 15:50 and ended at 18:50. How many minutes long?
9. Postal stamps
Jano and Peter exchanged postal stamps. Jano gave Peter 32 stamps of the missile for 8 stamps with turtles. How good was Jano after this exchange (how many he has surplus in exchanged stamps)?
10. Bus
On the 4-th stop take on 56 and take off 38 passengers. How many were added (write as positive number) or shrunk (write as negative number) the count of passengers?
11. Fridays
Friday 13th is in 4 days. What day is today and what day it is?
12. Minutes
Determine the difference in minutes: T1 = 2 3/20 h T2 = 2.3 h
13. Car parking
The car park has 45 motorcycles and 25 cars. 14 cars went away and 2 arrived, then departs 12 motorcycles and 2 arrive. How many motorbikes and cars there are now?
14. How manz
By how many is the product of the numbers 328 and 7 greater than its sum?
15. Company account
The company had an account of EUR 10,000. On Monday it withdraw 3,000 euros and Tuesday 6,000 euros. How much did the euro remain in the account?
16. Grandmother
Children's grandmother bought two identical toy cars and a doll. Total paid 492 Kč. The doll was 150 Kč. How much money cost 1 toy car?
17. A koala
A koala lives to be 14 years old in the wild. How much longer will a 2 year old koala probably live?