Boats and Streams with Explanation

Q8. If the speed of a boat is 15 km/hr and the ratio of downstream speed and upstream speed is 7 : 3. Find the speed of the stream?

A. 6 km/hr B. 10 km/hr
C. 5 km/hr D. 9 km/hr

Q9. A motorboat rows 32 km downstream and 14 km upstream. If 6 hours is taken to cover each distance, then the velocity of the current is

A. 1 km/hr B. 1.5 km/hr
C. 0.5 km/hr D. Cannot be determined

Q10. A boatman takes twice as long to go a distance upstream as to travel the same distance downstream. What is the ratio of the speed of the boatman (in still water) and the current?

A. 2 : 3 B. 1 : 3
C. 3 : 1 D. 4 : 3

Q11. A pirate travels 15 km downstream of a river in 3 hours 45 minutes and 2 hours 30 minutes to row a boat 5 km upstream. What is the speed of the current?

A. 2 km/hr B. 5 km/hr
C. 1 km/hr D. 4 km/hr

Q12. A river is running at 2 km/hr, a boat goes 6 km downstream and comes back to the initial point in 33 minutes. Find the speed of the boat in still water?

A. 22 km/hr B. 20 km/hr
C. 15 km/hr D. 25 km/hr

Q13. A speedboat travels downstream from point P to point Q and comes back to a point R in 19 hours. Point R is a midway between point P and point Q. If the speed of the speedboat is 14 km/hr and velocity of the stream is 4 km/hr, what is the distance between point P and point Q?

A. 160 km B. 140 km
C. 200 km D. 180 km

Q14. In still water, a boat can travel at 5 km/hr. It takes 1 hour to row to a place and come back. If the velocity of the stream is 1 km/hr, how far is the place?

A. 3.5 km B. 2.4 km
C. 2.6 km D. Date Inadequate