Boats and Streams Formulas with examples for SSC and Bank Exams
A boat takes half time in moving a certain distance downstream than upstream. what is the ratio between the rate in still water and the rate of current?
(A) 2 : 1
(B) 3 : 1
(C) 1 : 2
(D) 1 : 3
Correct Answer : B
A boat running downstreams covers a distance of 30 kms in 2 hours. While coming back the boat takes 6 hours to cover the same distance. If the speed of the current is half that of the boat, what is the speed of that boat in kmph?
(A) 15
(B) 5
(C) 10
(D) Cannot be determined
(E) None of these
Correct Answer : C
A motorboat, whose speed is 45 km./hr. in still water goes 180 km. downstream and comes back in a total of 9 hours. The speed of the stream (in km/hr.) is-
(A) 12
(B) 21
(C) 18
(D) 10
(E) 15
Correct Answer : E
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 current are respectively.
(A) 4 kmph and 3 kmph
(B) 4.5 kmph and 0.5 kmph
(C) 4 kmph and 2 kmph
(D) 5 kmph and 2 kmph
Correct Answer : B
Ratio between speed of boat in still water to speed of stream is 7 : 2. If 126 km is travelled downstream in 3.5 hours then find the difference between speed of boat in still water to speed of stream(in kmph)?
(A) 15
(B) 22
(C) 24
(D) 20
(E) 18
Correct Answer : D
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