While going upstream covering 20 km, a boat takes twice the time as it takes to cover 20 km downstream. The speed of boat in still water is thrice the speed of stream. How much time will the boat take to cover 40 km downstream?

While going upstream covering 20 km, a boat takes twice the time as it

1.	While going upstream covering 20 km, a boat takes twice the time as it takes to cover 20 km downstream. The speed of boat in still water is thrice the speed of stream. How much time will the boat take to cover 40 km downstream?
A.	3 hours
B.	2.5 hours
C.	4 hours
D.	6 hours
E.	Cannot be determined
Answer» F.