Foundation June 2017 Paper 2 Q13
13. Two companies, Sail-Away and Cross-Quick, have ferries that sail between Dover and Calais.
- Sail-Away ferries depart every 20 minutes.
- Cross-Quick ferries depart every 25 minutes.
Both companies have ferries that leave Dover at 9:00 a.m.
What is the next time that the two companies have ferries leaving Dover at the same time? [3]
| Scheme | Marks | Comments |
|---|---|---|
| Listing times…..(9:00), 9:20, 9:40…. AND (9:00), 9:25, 9:50…OR Listing multiples of 20 and 25 or prime factors of 20 and 25. | M1 | Allow for sight of 20, 40, 60… AND 25, 50, 75, … OR sight of 2 x 2 x 5 AND 5 x 5. |
| Sight of 100 as the LCM or the number of minutes OR one or two lists with 10.40 appearing correctly in at least one list. | A1 | |
| Time of 10:40 (a.m.) | A1 | FT ‘their 100’ provided M1 awarded. |
| (3) |