A man wants to go abroad by ship and return by air. He has a choice of 4 ships to go and 5 airlines to return. In how many ways can man perform his journey?

A man wants to go abroad by ship and return by air. He has a choice

1.	A man wants to go abroad by ship and return by air. He has a choice of 4 ships to go and 5 airlines to return. In how many ways can man perform his journey?
A.	20
B.	18
C.	24
D.	16
Answer» B. 18