Test on 24/12/2013 Topic: Boat & Streams

Department of Placement & Training

1.A man can row upstream at 8 kmph and downstream at 13 kmph. The speed of the stream is :

A.2.5 km/hrC.5 km/hr

B.4.2 km/hrD.10.5 km/hr

2.The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?

A.3C.6

B.5D.3

3.The Speed of a boat in still water is 10 kmph. If it can travel downstream 20 kms in the same time as it can travel 12 kms upstream. What is the speed of the current?

A.2 C.5

B.3 D.2.5

4.The speed of a boat in still water is 8 km/hr. If it speed downstream be 15 km/hr, then speed of the stream is:

A.7.5 km/hrC.9 km/hr

B.7 km/hrD.None of these

5.A man can row three-quarters of a kilometre against the stream in 111/4minutes / .
The speed (in km/hr) of the man in still water is:

A.2 C.4

B.3 D.5

6.A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?

A.2 : 1 C.8 : 3 E.None of these

B.3 : 2 D.Cannot be determined

7.The effective speed of travel of a boat downstream is 20 kmph whereas it is 10 kmph upstream. What is the speed of the current?

A.2 C.5

B.7 D.6

8.A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

A.8.5 km/hrC.10 km/hr

B.9 km/hrD.12.5 km/hr

9.A swimmer covers a distance of 28 km against the current and 40 km in the directions of the current. If in each case he takes 4 hours, then the speed of the current is

A.3.5 km/hrC.2.5 km/hr

B.1.5 km/hrD.None of these

10.A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

A.2 hoursC.4 hours

B.3 hoursD.5 hours

11.A boat moves downstream at the rate of one km in 10 minutes and upstream at the rate of 4 km an hour. What is the velocity of the current?

A.5 km/hrC.1 km/hr

B.3 km/hrD.None of these

12.The current of a stream runs at the rate of 2 km per hr. A motor boat goes 10 km upstreams and back again to the starting point in 55 min. Find the speed of the motor boat in still water?

A.22C.25

B.23D.24

13.If a man's rate with the current is 12km/hr the rate of the current is 11/2km/hr / , then his
rate against the current is

A.13 km/hrC.9 km/hr

B.7 km/hrD.None of these

14.A man rows downstream 33 km and upstream 27 km taking 3 hrs each time. What is the velocity of the current?

A.3 C.1

B.5 D.1.5

15.A boat covers a certain distance downstream in 1 hour, while it comes back in
1 / 1
2
/ hours. If the speed of the stream be 3kmph, What is the speed of the boat in still water?

A.12 kmphC.14 kmphE.None of these

B.13 kmphD.15 kmph

16.A man can row 10 kmph in still water and the river is running at 2 kmph. If the man takes 1 hr to row to a place and back, how far is the place?

A.4.8C.5

B.4.5D.5.6

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:

A.2 km/hrC.3 km/hr

B.2.5 km/hrD.4 km/hr

18.A man can row at a speed of 10 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 4 km/hr. Find his average speed for total journey.

A. / 9 / 2 / km/hr
5
C. / 11 / 2 / km/hr
5
B. / 8 / 2 / km/hr
5

D.None of these

19.A man rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:

A.1 km/hrC.1.8 km/hr

B.1.5 km/hrD.3.5 km/hr

20.A man can row 6 km/hr in still water. If the river is running at 2 km/hr, it takes 3 hours more in upstream than to go downstream for the same distance. How far is the place?

A.24 kmC.36 km

B.28 kmD.None of these

21.A man can row 6 kmph is still water. If the river is running at 1 kmph it takes 90 min to row to a place and back. How far is the place?

A.410 C.490

B.415 D.480

22.A boat covers a certain distance downstream in 2 hours but takes 4 hours to return upstream to the starting point. If the speed of the stream be 3 km/hr, find the speed of the boat in still water.

A.11 km/hr

C.9 km/hr

B.13 km/hr

D.None of these

23.Two pipes A and B can fill a tank in 20 hrs and 30 hrs respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

A.12

C.13

B. / 1
12
D. / 1
13

24.In a river flowing at 2 km/hr, a boat travels 32 km upstream and then returns downstream to the starting point. If its speed in still water be 6 km/hr, find the total journey time.

A.16 hours
C.14 hours

B.12 hours
D.None of these

25.A Cistern is filled by pipe A in 9 hrs and the full Cistern can be leaked out by an exhaust pipe B in 10 hrs. If both the pipes are opened in what time the Cistern is full?

A.45

C.90

B. / 1
10
D. / 1
90

26.Tap 'A' can fill the tank completely in 4 hrs while tap 'B' can empty it by 8 hrs. By mistake, the person forgot to close the tap 'B', As a result, both the tapes, remained open. After 4 hrs, the person realized the mistake and immediately closed the tap 'B'. In how much time now onwards, would the tank be full?

A.2

C. / 1
2

B.3

D. / 1
4
27.A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:
A. / 4 / B. / 5
C. / 6 / D. / 10
28.In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
A. / 3 km/hr / B. / 5 km/hr
C. / 8 km/hr / D. / 9 km/hr
29.Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:
A. / 16 hours / B. / 18 hours
C. / 20 hours / D. / 24 hours