Foundation November 2018 Paper 1 Q18
18 Doctor Jones starts an appointment every 20 minutes.
Doctor Warholm starts an appointment every 35 minutes.
The first appointment for both doctors starts at 8.30 am.
What is the next time that they have an appointment start at the same time? [4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 10:50 [am] | 4 | SC3 for 10:50 pm OR B2 for LCM as 140 or 2 hours 20 [min] and M1 for [0]8:30 plus their LCM OR M1 for 20 = 2 \(\times\) 2 \(\times\) 5 and 35 = 5 \(\times\) 7 and M1 for [0]8:30 plus their LCM OR B1 for listing [0]8:50, [0]9:10, [0]9:30 and B1 for listing [0]9:05, [0]9:40, 10:15 | Their LCM must be correctly converted to hours and minutes No incorrect times in between [0]8:30 and [0]9:30 or [0]8:30 and 10:15 |