(1) In the right triangle ACD, BD = √( AB &；; Sup2 advertising and advertising. sup2)=√( 150 & amp； sup2-90 & amp； sup2)= 120km

120/20=6 (hours)

After 6 hours, the typhoon center moved from point B to point D.

(2)60/6=5 (hours), that is, tourists need 5 hours to evacuate to a safe place.

Therefore, it is necessary to evacuate within 1 hour after receiving the typhoon warning, and it is best to evacuate in the direction of BC.