Answer: Marie is 34 and Joanna is 21.
To find this you first subtract 13 from 55. This will give you 42, which you then divide by 2 to find Joanna's age. Finally you simply add 13 to Joanna's age to find Marie's age (34). To check this, add 34 and 21 together, which gives you 55.
I hope this helps!
let's bear in mind that there are, 5280 feet in 1 mile, and that there are 60 minutes in 1 hour and 60 seconds in 1 minute.
bear in mind that we can flip those fractions upside-down, as needed, and the rate remains, we'd flip them to cancel a unit.