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|