Q.41. A man can row upstream at 8 kmph and downstream at 13 kmph. The speed of the stream is:
(A) 2.5 km/hr
(B) 2.4 km/hr
(C) 6 km/hr
(D) 5.2 km/hr
(E) None of these
Q.42. A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
(A) 3 km/hr
(B) 6 km/hr
(C) 9 km/hr
(D) 12 km/hr
(E) None of these
Q.43. 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?
(A) 1 : 2
(B) 8 : 4
(C) 8 : 3
(D) 5 : 3
(E) None of these
Q.44. A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is :
(A) 8.5 km/hr
(B) 9 km/hr
(C) 10 km/hr
(D) 21 km/hr
(E) None of these
Q.45. A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
(A) 3 hours
(B) 5 hours
(C) 4 hours
(D) 8 hours
Q.46. The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is :
(A) 2.1 km
(B) 1.8 km
(C) 4.2 km
(D) 3.6 km
Q.47. A boat takes 19 hours for traveling downstream from point A to B and coming back to a point C midway between A and B. If the velocity of the stream is 4 kmph and the speed of the boat in still water is 14 kmph, what is the distance between A and B?
(A) 170 km
(B) 180 km
(C) 190 km
(D) 200 km
Q.48. The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is:
(A) 1.5km/hr
(B) 2.5 km/hr
(C) 3 km/hr
(D) 4.5 km
Q.49. A man rows to a place 48 km distance 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. The rate of the stream is :
(A) 1 km/hr
(B) 2.5 km/hr
(C) 3.8 km/hr
(D) 4.5 km/hr
Q.50. In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is :
(A) 2
(B) 4
(C) 8
(D) 9
(E) None of these
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