I arrive in Pudong airport Shanghai at 3:00 p.m., which is the best public transit to Hangzhou

You could take one high speed train at Hongqiao station to Hangzhou which just takes around 1hr. From Pudong airport to Hongqiao Station, you can take the subway line 2 directly. About the train schedules from Shanghai Hongqiao Station to Hangzhou, you could search on the web.