Boat and Stream

1. A man can now a boat at 10 km/hr in still water. If the speed of the stream is 6 km/hr, the time teken to row a distance of 80 km downstream is:

• ক. 8 hours
• খ. 5 hours
• গ. 10 hours
• ঘ. 20 hours

2. In a stream running at 2 km/hr, a motor boat goes 10 km upstream and back again to the starting point in 55 minutes. Find the speed of the motor boat in the still water.

• ক. 6 km/hr
• খ. 5.5 m/hr
• গ. 6.45 km/hr
• ঘ. 7 km/hr

3. A man can row downstream at 10 kmph and upstream at 5 kmp. The man's rowing rate in still water is--

• ক. 2.5 km/hr
• খ. 5 km/hr
• গ. 7.5 km/hr
• ঘ. 15 km/hr

4. A boat sailing against a stream of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travel the same distance. What is the speed of the stream?

• ক. 1/2 km/hr
• খ. 1 km/hr
• গ. 2 km/hr
• ঘ. 1.5 km/hr

5. A man can cross 10 miles distance of a river in favor of the stream in 2 hours. He can come back against the stream along the same way in 5 hours. What is the average speed, in miles per hour, for the entire trip?

• ক. 20/7
• খ. 10/7
• গ. 7/10
• ঘ. 7/20

6. A man rowing in favour of current can go 80 km in 10 hrs and he can go the same distance in 40 hrs against the current. What is the speed of the current per hour?

• ক. 3 km
• খ. 4 km
• গ. 5 km
• ঘ. 10 km

7. The velocity of a boat rowed downstream is three times that of the same boat rowed upstream. If the speed of the stream is 2.5 miles per hour what is the speed of rowing in miles/hr?

• ক. 5
• খ. 3
• গ. 2
• ঘ. 6

8. A ferry can travel twice as fast when empty as when it is full. It travels 20 miles with full load, spends 1 hours for unloading & returns to its original port empty. It took 11 hours to complete the journey. What is the speed when the ferry is empty?

• ক. 5
• খ. 4.5
• গ. 4
• ঘ. 6

9. A man can row upstream at 10 km/h and downstream at 16 km/h. His rate in still water is---

• ক. 12
• খ. 26
• গ. 13
• ঘ. 6

10. A man can row downstream at 14 km/h and upstream at 8 km/hr. What is the rate of the stream?

• ক. 22
• খ. 11
• গ. 6
• ঘ. 3

11. If a man row at 10 km/h along the current & the rate of the current is 2 km/h, what is the man's rate against the current?

• ক. 6
• খ. 5
• গ. 8
• ঘ. 13

12. A man rows upstream 24 km and downstream 36 km, taking 6 hours each time. The velocity of the current will be:

• ক. 1
• খ. 5
• গ. 4
• ঘ. 3

13. Speed of the boat in standing water is 6 km/h and the speed of the stream is 2 km/h. What will be the total time if a man goes by the boat upstream 32 km and comes back to the starting point?

• ক. 6 h
• খ. 2 h
• গ. 8 h
• ঘ. 10 h

14. Speed of a boat in standing water is 10 km/h and the speed of the stream is 2 km/h. A man rows to a place at a distance of 48 km and comes back to the starting point. What will be the total time taken by him?

• ক. 10
• খ. 12
• গ. 6
• ঘ. 4

15. A man can rows 6 km/hr in still water. When the river is running at 1.5 km/hr, it takes him 1.5 hour to row to a place and back. How far is the place?

• ক. 4.2 km
• খ. 9.5 km
• গ. 6 km
• ঘ. 5 km

16. A certain river has a current of 3 miles per hour. A boat takes twice as long to travel upstream between two points as it does to travel downstream between the same two points. What is the speed of the boat in still water?

• ক. 3 miles per hour
• খ. 6 miles per hour
• গ. 9 miles per hour
• ঘ. 12 miles per hour

17. The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is:

• ক. 2 km/hr
• খ. 2.5 km/hr
• গ. 3 km/hr
• ঘ. 4 km/hr