The speed of boat in still water is 20 km/h, if it can travel 16 km upstream in 1 h. What time it would take to travel the same distance downstream?

A) 20 min

B) 40 min

C) 30 min

D) 15 min

E) 45 min


A boat takes 19 h for travelling downstream from point A to point B and coming back to point C, midway between A and B. If velocity of the stream is 4 km/h and the speed of the boat in still water is 14 km/h. What is the distance between A and B ?

A) 160 km

B) 180 km

C) 200 km

D) 220 km

E) 240 km


Speed of boat in standing water is 9 km/h and the speed of the stream is 1.5 km/h. A man rows to place at distance of 105 km and comes back to the starting point. The total time taken by him is :

A) 16 h

B) 18 h

C) 20 h

D) 24 h

E) 26 h


A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is 

A) 2 : 1

B) 3 : 1

C) 3 : 2

D) 4 : 2

E) None of these


A motor boat can travel at 10 km/h in still water .If travelled 91 km downstream in a river and then returned ,taking altogether 20 hrs .Find the rate of flow of river 

A) 3 km/h

B) 4 km/h

C) 4.5 km/h

D) 5 km/h

E) 5.26 km/h