Quantitative Aptitude

1. A boat travels 24 km upstream in 6 h and 20 km downstream in 4 h. The, the speed of a boat in still water and the speed of water current are respectively 

(a) 4 km/h and 3 km/h

(b) 4.5 km/h and 0.5 km/h

(c) 4 km/h and 2 km/h

(d) 5 km/h and 2 km/h

2. The current of a stream runs at the rate of 4 km in an hour. A boat goes 6 km and comes back to the starting point in 2 h. The speed of the boat in still water is 

(a) 6 km/h

(b) 8 km/h

(c) 7.5 km/h

(d) 6.8 km/h

3. A sailor goes 12 km downstream in 48 min and returns in 1 h 20 min. The speed of the sailor in still water is 

(a) 12 km/h

(b) 12.5 km/h

(c) 13 km/h

(d) 15 km/h

4. The speed of the current is 5 km/h. A motorboat goes 10 km upstream and back again to the starting point in 50 min. The speed (in km/h) of the motorboat in still water is 

(a) 20

(b) 26

(c) 25

(d) 28

5. A boat covers 12 km upstream and 18 km downstream 3 h, while it covers 36 km upstream and 24 km downstream in 61/2 h. What is the speed of the current?

(a) 1.5 km/h

(b) 1 km/h

(c) 2 km/h

(d) 2.5 km/h

6. A boat covers 24 km upstream and 36 km downstream in 6 h, while it covers 36 km upstream and 24 km downstream in 61/2 h. The speed of he current is

(a) 1 km/h

(b) 2 km/h

(c) 1.5 km/h

(d) 2.5 km/h

7. A boat goes 6 km in an hour in still water but takes thrice as much time in going the same distance against the current. The speed o the current (in km/h) is

(a) 4

(b) 5

(c) 3

(d) 2

8. Speed of a boat is 5 km/h in still water and the speed of the stream is 3 km/h. If the boat takes 3 h to go to a place and come back, the distance of the place is 

(a) 3.75 km

(b) 4 km

(c) 4.8 km

(d) 4.25 km

9. A man can swim at the rate of 4 km/h in still water. If he speed of the water is 2 km/h. Then, the time taken by him to swim 10 km upstream is

(a) 2 1/2 h

(b) 3 1/2 h

(c) 5 h

(d) 4 h

10. A boy can swim in still water at a speed of 10 km/h. If the speed of the current would have been 5 km/h, then the boy could swim 60 km

(a) upstream in 4 h

(b) upstream in 12 h

(c) upstream in 6 h 

(d) downstream in 4 h

Answers ..!!!
1. (b) 
2. (b) 
3. (a) 
4. (c) 
5. (c) 
6. (b) 
7. (a) 
8. (c) 
9. (c) 

10. (b)