Please advise me which sentence is correct.
A1. You may either take the airport bus or take MTR to the HK Station then take the Airport Express.
A2. You can either take the airport bus or take MTR to the HK Station then take the Airport Express,
B1. He is forty-eight years old.
B2. He is forty eight years old.
(forty-five - with hyphen or without a hyphen?)