Q: Four persons can cross a bridge in 3,7,13,17 minutes.Only two can cross at a time.Find the minimum time taken by the four to cross the bridge ?

Q: Four persons can cross a bridge in 3,7,13,17 minutes.Only two can c

1.	Q: Four persons can cross a bridge in 3,7,13,17 minutes.Only two can cross at a time.Find the minimum time taken by the four to cross the bridge ?
A.	17 minutes
B.	20 minutes
C.	34 minutes
D.	12 minutes
Answer» C. 34 minutes