7/25/2019 CPA CookingBolognese Student Worksheet (1)

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Hand-Out 1

Your Task

When you leave home, you will need to startbeing able to cook your own meals. You would like

to cook a spaghetti bolognese for tea tonight but

your friends would also like to go to the cinema

with you. It is your task to nd out the quickest

time it takes to cook spaghetti bolognese, so that you can tell your friends

what the earliest lm showing you can go and see is.

Useful Information

You start cooking at exactly pm.

!he possible lm times available are"

.#$pm, .%&pm, '.$$pm, '.(&pm, ).$$pm or

).#$pm

It will take you a total of ( hour to eat your tea and wash up after.

It will take you (& minutes to walk to the cinema.

Working out the Earliest Start Time (EST)

*or +!, we start from the start node and end at the end node -i.e. we

work forwards.

+! / +arliest tart !ime of the previous activity 0 1uration of the

previous activity

If there are two or more previous activities, choose the highest+!.

+.g.

2 0 2 / (3

) 0 ( / ($

(3 is therefore the

highest +! so choose (3

% 0 3 / 2

$ 0 % / %1-24-3

!5-%"

!he +! of the start

node is alwa#s$

% 0 & / )

1$

+-(6-&

%

7/25/2019 CPA CookingBolognese Student Worksheet (1)

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Working out the &atest 'inish Time (&'T)

*or 7*! we start from the end node and end at the start node -i.e. we work

akwards.

7*! / 7atest *inish !ime at the end of the following activity 8 1uration of

the following activity

If there are two or more activities which follow on from the same node,

choose the smallest 7*!.

+.g. -using the previous example

Your Turn*

9lease complete the following activity network, calculating your early and

start times.

(3 8 2 /

2!he 7*! of the end

node is alwa#s

equal to its +arliest

tart !ime

!he 7*! of the start

node is alwa#s$

%

11 !his is the shortest time

the pro:ect can be

completed in.

1$

1$

+-(

(3 8 ( /

((

1-2

6-&

4-3

2 8 3 / %

(( 8 & / 2

% is therefore the

smallest 7*! so choose %

!

!5-%

"

"

1-#$

5-&

6-

+-#

4-($

*-3

;-3