HUSBAND: Honey, where should we go this year for vacation?
WIFE: I don’t care, as long as it’s romantic.
AARON: What’s the time difference between San Francisco and London?
KATIE: I believe London is 10 hours ahead of San Francisco.
HARRY: I’m looking online here, and it says we can get a discount if we stay 10 days.
MOLLY: Ten 10 days would be too long. I only have 5 days of annual leave left.
KEN: We need to plan a getaway ASAP. I need to clear my head.
IRIS: OK honey. Where would you like to go?
BOB: Let’s get a group of guys together and head down to the Philippines.
OSCAR: I’ll jump on the web and see if there are any all inclusive deals available.
MARY: If we leave at 5, that will put us there around 11:30 Tuesday.
SAM: That seems like a long time. How much time would we save if we took a flight instead?
Question: How can we talk about the time difference between different cities?
Answer: City A is _____hours ahead/behind City B.