You have a little over 6 hours of gas.
Minus 36 from each one you can do it on a calculator:)
The HCF is the Highest Common Factor of a number in this case 54. This is the highest number times another number which = 54. The HCF for 54 is 18.
So, Hayden has 1224 Apples
Jenny has 1889 Apples.
All your doing is ADDING the apples to get your answer of : 3113 apples together.