Intermediate November 2019 Unit 2 Q5
5. In this question, you will be assessed on the quality of your organisation, communication and accuracy in writing.
A task takes 6 hours 15 minutes to complete.
\(\dfrac{2}{5}\) of this time is spent on planning.
How long was spent on the rest of the task?
Give your answer in hours and minutes.
You must show all your working. [5 + 2 OCW]
| Scheme | Marks | Comments |
|---|---|---|
| Sight of 6·25 (hrs) OR 375 (min) | B1 | |
| (Planning =) \(\dfrac{2}{5}\) × 6·25 OR \(\dfrac{2}{5}\) × 375 | M1 | F.T. ‘their time’ in hours or in minutes. May be seen in parts (1/5th and then 2/5ths) |
| = 2·5 (hrs) OR 150 (min) | A1 | [Note: 2/5 × 6·15 OR 2/5 × 615 is B0M1(FT) = 2·46(hrs) OR 246(min) A1(FT) BUT A0 if 2·46 then used as 2h 46m ] |
| (Remainder of work = 6·25 − 2·5 OR 375 – 150 =) 3·75 (hrs) OR 225 (min) | B1 | F.T. ‘their derived times’ using same units. |
| = 3 hours 45 minutes | B1 | F.T. correct conversion of ‘their times’, correct to the nearest minute (rounded or truncated), if of equivalent difficulty. Allow unambiguous indication of units. |
| OCW Organisation and Communication. | OC1 | For OC1, candidates will be expected to:
|
| Accuracy of writing. | W1 | For W1, candidates will be expected to:
|
Alternative method 1
| Scheme | Marks | Comments |
|---|---|---|
| Sight of 6·25 (hrs) OR 375 (min) | B1 | |
| (Remaining work takes) 3/5 of time | B1 | |
| = 3/5 × 6·25 OR 3/5 × 375 | M1 | F.T. ‘their time’ in hours or in minutes. |
| = 3·75 (hrs) OR 225 (min) | A1 | |
| = 3 hours 45 minutes | B1 | F.T. correct conversion of ‘their times’, correct to the nearest minute (rounded or truncated), if of equivalent difficulty. Allow unambiguous indication of units. |
Alternative method 2
| Scheme | Marks | Comments |
|---|---|---|
| (Planning =) \(\dfrac{2}{5}\) × 6 AND \(\dfrac{2}{5}\) × 15 | M1 | |
| = 2·4(hrs) AND 6(min) | A1 | 2·4 hrs may be given as 2hrs 24min. |
| = 2hrs 30min | A1 | C.A.O. |
| (Remainder of work =) 6(hr) 15(min) −2(hrs) 30(min) | M1 | F.T. ‘their derived planning time’ in hours and min. |
| = 3 hours 45 minutes | A1 |
Alternative method 3
| Scheme | Marks | Comments |
|---|---|---|
| (Remaining work takes) 3/5 of time | B1 | |
| = \(\dfrac{3}{5}\) × 6 AND \(\dfrac{3}{5}\) × 15 | M1 | |
| = 3·6(hrs) AND 9(min) | A1 | 3·6 hrs may be given as 3hrs 36min. |
| = 3hrs 36min + 9(min) | M1 | F.T. ‘their derived times’ in hours and min. |
| = 3 hours 45 minutes | A1 |
In the original the OC1 and W1 rows are printed after the alternative methods.
Corrected by Westie's Workshop
- The board's mark scheme printed “used as as 2h 46m”. Changed to “used as 2h 46m” because the word “as” was repeated by mistake.
Original: see the board's mark scheme PDF (link above).