Timetables are used in many places in society. They are a useful and organised way of displaying schedules.
Time is represented in two main formats: the 12 hour system and the 24 hour system.
12 hour system
24 hour system
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converting from 12 hour to 24 hour
Converting from 24 hour to 12 hour
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When adding and subtracting times, always remember that there are 60 minutes in an hour.
How much time passes from 1:30pm to 5:15pm?
First, find how much time is needed to get to the next hour:
The next hour is 2pm. To get to 2pm, you have to add 30 minutes to 1:30pm.
Then, find how much time is needed to get to 5pm:
From 2pm to 5pm, you have to add 5−2=3 hours.
Find how much time is needed to get to 5:15pm:
From 5pm to 5:15pm, you have to add 15 minutes.
Add all the times together:
30 minutes + 3 hours + 15 minutes = 3 hours + 45 minutes.
3 hours and 45 minutes passes from 1:30pm to 5:15pm
Timetables are used to organise schedules. They are often used in bus and train stations and they tend to use the 24 hour time format.
In the train timetable given, assume all trains take the same amount of time to make the same journey.
i) Find the values of X and Y.
ii) A family is at Cambridge and wants to arrive at Paddington before 2:30pm. What is the latest train they can take?
The time it takes for the trains to go from Cambridge to Tottenham is always the same.
So, to find X and Y, first find how long it takes Train A to go from Cambridge to Tottenham:
This is the same as finding the time from 11:02 to 12:27:
11:02 to 12:00: +58 minutes
12:00 to 12:27: +27 minutes
So, the time it takes to go from Cambridge to Tottenham is:
Convert this to minutes and hours:
85 minutes =1 hour and 25 minutes
Add this time onto 12:15 to find the value of X: