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