Boat and Stream
Knowing the entire exam syllabus and all relevant themes is crucial for any competitive exam candidate who wants to advance in his or her career in the government sector and private sectors .we discussed about Boat and Stream:
Stream and Boat idea:
Answering queries supported the boat and stream notion involves variety of subconcepts. The four terms that a candidate must comprehend so as to understand the notion of streams area unit listed below.
Stream: -A river's flowing water is cited as a stream.
Upstream :- a ship is claimed to be moving upstream if it's moving downstream of the stream. The boat's upstream speed during this state of affairs is its web speed.
Downstream: - a ship is claimed to be moving downstream if it's occupation a similar direction because the stream. during this instance, the boat's downstream speed is its web speed.
Still Water: - during this case, the water is seen as being immobile.
Formula for Boat and Stream:-
Upstream:- (u−v) km/hr
Downstream:- (u+v)Km/hr
Speed of Boat in Still Wate:-r ½ (Downstream Speed + Upstream Speed)
Speed of Stream :-½ (Downstream Speed – Upstream Speed)
Average Speed of Boat:- {(Upstream Speed × Downstream Speed) / Boat’s Speed in Still Water}
Speed of boat or swimmer in still water:- 1/2 (Downstream Speed + Upstream Speed)
Example of Boat stream questions :
Q. If the ratio of the speed of a boat in upstream and the speed of the stream is 8 : 1. If
the boat can travel 500 km downstream in 20 hours then find the total distance
travelled by the boat in still water in the same time?
A. 425 km
B. 459 km
C. 441 km
D. 450 km
E. None of these
Q.In downstream, two steamers A and B start simultaneously from the point P but the
steamer B reaches point Q, 2 hours before the steamer A reaches the same point. If
the distance between point P and Q is 120 km and the speed of steamer B in upstream
is 3 km per hour more than that of steamer B in upstream and the speed of stream is 2
km per hour, then find the sum of the speed of steamer A in still water and that of
steamer B in still water?
A. 21 km per hour
B. 20 km per hour
C. 23 km per hour
D. 27 km per hour
E. None of these
Q.The distance between two points on a river is D km. A man rowing a boat along the
stream finds that the distance of rowing along the stream is 30 times the total
distance and when he started rowing against the stream the distance he rowed was
found 4 times of total distance. The total time taken against the stream is 10% more
than that along the stream. If the boat cover 135 km along the stream in 9 hours.
What is the speed of stream?
A. 3 km/h
B. 3.25 km/h
C. 3.5 km/h
D. 2.5 km/h
E. None of these
Q..A motorboat, whose speed in 20 km/hr in still water goes 40 km downstream and comes back in a total of 5 hours . The speed of the stream (in km/hr) is: A. 13 km/h B. 25 km/h C. 35 km/h D. 20 km/h E. None of these |
Q. In one hour, a boat goes 15 km/hr along the stream and 7 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
A. 12 km/h
B. 10 km/h
C. 11 km/h
D. 09 km/h
E. None of these
Q. A man's speed with the current is 18 km/hr and the speed of the current is 3.5 km/hr. The man's speed against the current is:
A. 12 km/h
B. 10 km/h
C. 11 km/h
D. 09 km/h
E. None of these
Q. The speed of a boat in still water in 20 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 20 minutes is:
A. 8 km/h
B. 5 km/h
C. 10 km/h
D. 9 km/h
E. None of these
Boat and Stream
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