(6) A person can row 18 km upstream and 24 km downstream in 6 hours. If the speed of the stream is 3 km/hr, find the speed of the person in still water.
- (a) 9 km/hr
- (b) 10 km/hr
- (c) 12 km/hr
- (d) 15 km/hr
(7) If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 km/hr, find the speed of the boat in still water.
- (a) 10 km/hr
- (b) 8 km/hr
- (c) 12 km/hr
- (d) 6 km/hr
(8) A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hours. If the speed of the stream is 4 km/hr, what is the distance covered?
- (a) 12 km
- (b) 16 km
- (c) 20 km
- (d) 24 km
(9) A person 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. Find the speed of the stream.
- (a) 2 km/hr
- (b) 1 km/hr
- (c) 3 km/hr
- (d) 4 km/hr
(10) A boat travels 20 km upstream in 2 hours and 60 km downstream in 3 hours. Find the speed of the boat in still water and the speed of the stream.
- (a) 15 km/hr, 5 km/hr
- (b) 20 km/hr, 10 km/hr
- (c) 25 km/hr, 5 km/hr
- (d) 30 km/hr, 10 km/hr
