Q. 4 A man can swim at the rate of 4 km/ hour in still water. If the speed of the water is 2 km/hour, then the time taken by him to swim 10 km upstream is

Q. 5 A boy can swim in still water at a speed of 10 km/hr. If the speed of the current would have been 5 kmph, then the boy could swim 60 km in how much time?

(A) Upstream in 4 hours (B) Downstream in 12 hours (C) Upstream in 6 hours (D) Downstream in 4 hours

Q. 8 A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of water current are respectively.

(A) 4.5 km/hour and 3 km/hour (B) 4.5 km/hour and 0.5 km/hour (C) 4 km/hour and 2 km/hour (D) 5 km/hour and 2 km/hour

Answer: (B) 4.5 km/hour and 0.5 km/hour Explanation: N/A

Q. 9 A man swims downstream a distance of 15 km in 1 hour. If the speed of the current is 5 km/hour, then the time taken by the man to swim the same distance upstream is

Q. 10 The current of a stream runs at the rate of 4 km an hour. A boat goes 6 km and comes back to the starting point in 2 hours. The speed of the boat in still water is

Q. 13 A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 hours and a half. If the speed of water is 1.5 km/h, then the speed of the boat in still water is

Q. 14 A man can row 30 km downstream and return in a total of 8 hours. If the speed of the boat in still water is four times the speed of the current, then the speed of the current is.

Q. 15 A person can row 7(1/2) km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream is

Q. 17 The speed of a boat is 5 km per hour in still water and the speed of the stream is 3 km per hour. If the boat takes 3 hours to go to a place and come back, then the distance of the place is

Q. 19 The speed of a boat in still water is 6 Km/hr and the speed of stream is 1.5 Km/hr. A man rows to a place at a distance of 22.5 Km and comes back to the starting point. The total time taken by him is