Page 335 - Math Smart - 7

15.1.4 Timetables

A timetable is a table that shows the times at which certain events occur. Times
are usually shown using a 24-hour clock. Examples include school, train, bus and
flight timetables. Timetables are a tool for planning. Timetables often show
departure times, and sometimes arrival times.

Example 8

This is part of a timetable for the tram at the Singapore Zoo.
Each column shows the departure time of a tram.

Departure times
1 Location Tram 1 Tram 2 Tram 3j .The first tram
leaves the main
1 Main entrance 08 45"*" 09 15 09 45
entrance at
\ Leopard trail 09 25 09 55 10 25 ' 08 45.

1 East Lodge trail 10 15 10 45 11 15
1 Forest Giants trail 11 GO 11 30 12 00
1 Elephant and rhino sanctuary 11 55 12 25 12 55

1 Creatures of the night enclosure 12 35^ 1305 13 35 The first tram
arrives at
Creatures of the
O How long does it take for Tram 1 to travel from the main entrance to the night enclosure
Creatures of the night enclosure? at 12 35.
O Ari wants to be at the Elephant and rhino sanctuary by 1.15 p.m. What is the
latest tram he can catch from the main entrance?
O Beth gets off Tram 1 at the East Lodge trail because she wants to spend some
extra time there. What Is the maximum amount of time Beth can spend at the
East Lodge trail if she wants to arrive at the Creatures of the night enclosure
at 13 35?

Solution
O The tram leaves the main entrance at 08 45 and arrives at Creatures of the
night enclosure at 12 35.
From 09 00 to 12 00
= 3h From 12 00 to 12 35
From 08 45 to 09 00
= 35 min
= 15 min
H 1 ^ =1 1 ^
7 8 9 10 11 12 13 14
Time Interval = 15 min + 3 h + 35 min = 3 h 50 min
@ 1.15 pm—>-13:15
The 09 45 tram arrives at the Elephant and rhino sanctuary at 12 55. Tram 3 is
the latest tram that Ari can take and still arrive by 1.15 p.m.
@ Tram 3 leaves East Lodge trail at 11 15 and arrives at the Creatures of the
night enclosure at 13 35. Beth arrived at the East Lodge trail at 10 15. She can
spend 1 h at the East Lodge trail.