Boats and Stream

61 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?

62 A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

63 A boat covers a certain distance downstream in 1 hour, while it comes back in 1($$\frac{1}{2}$$) hours. If the speed of the stream be 4 kmph, what is the speed of the boat in still water?

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

65 Speed of a boat in standing water is 14 kmph and the speed of the stream is 1.2 kmph. A man rows to a place at a distance of 4864 km and comes back to the starting point. The total time taken by him is:

66 A boat running downstream covers a distance of 24 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What will be the speed of the boat in still water?

67 A boatman goes 2km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationery water?

68 Speed of a boat in standing water is 9 km/hr and the speed of the stream is 1.5 km/hr. A woman rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by her is:

69 A boat covers a certain distance downstream in 4 hours but takes 6 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

70 A man rows to a place 48 km distant and come 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: