1 Find the HCF and LCM of:
a 224 and 336
b 18 and 42
c 45 and 150

1 Three patients visit the doctor at intervals of 8 days, 15 days and 24 days, respectively. If they all go to the doctor on 1 March, what will be the date when they next all go to the doctor on the same day?

2 Three swimmers take 28 seconds, 44 seconds and 68 seconds to complete a lap of the pool. If they start together, how long will it be before they are side by side at one end of the pool again?

3 A bell rings every 15 minutes and a whistle is blown every 18 minutes. The bell is rung and the whistle is blown at 8:00 am. How long will it be before the bell is rung and the whistle blown at the same time again?

4 Anthony runs a loop of a circular track in 65 seconds. Joseph takes 75 seconds to run around the same track. They both start at the same point. How long will it be before they are at the same point again?​