How long will it take to row 20 km upstream if the stream is allowed to row 10 km in 10 minutes in still water and the same distance in 8 minutes?
Time requires to travel 20 km upstream is 26.67 min . One can row 10 km in 10 minutes in still water . The same distance in 8 minutes with the stream .
How long will it take to row 20 km?
∴ Speed of stream = 15 km/hr. Hence upstream speed = 60 – 15 = 45 km/hr. So time taken to cover 20 km = 20/45*60 = 26.67min.
What is the ratio of the speed of the boat in still water and the stream if a man?
इनमें से कोई नहीं। Hence, option (D) is correct. The ratio of the speed of boat in still water to the speed of stream is 16 : 5.
What will be the boat’s speed in still water if the boat takes 6 hours to row 24 km upstream and 4 hours to row the same distance downstream?
Speed of upstream = 24 / 6 = 4 km / hr. Speed of downstream = 35 / 7 = 5km / hr. ∴ Speed of man in still water = (4 + 5) / 2 = 4.5 km / hr.
How do you solve boats and streams problems?
⇒ b = (d+u) / 2 which gives the speed of the boat in terms of downstream and upstream speed. Subtracting the equation (i) and (ii), we get d – u = 2w ⇒ w = (d-u) / 2 which gives the speed of the stream in terms of downstream and upstream speed. You should remember these boats and streams formulas.
What is the formula of upstream and downstream?
And, the direction against the stream is called upstream. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. Speed upstream = (u – v) km/hr.
How long will it take to row?
This can take anywhere from 30 minutes to 1 hour depending on some factors like age, weight, heart rate and rowing intensity.
What will be the speed of boat in still water?
If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. Speed upstream = (u – v) km/hr. (a + b) km/hr….Exercise :: Boats and Streams – Important Formulas.
| Rate of stream = | 1 | (a – b) km/hr. |
|---|---|---|
| 2 |
What is the speed of the boat in still water the speed downstream is 12 km h?
The speed downstream is 12 kmph. II. The speed upstream is 4 kmph. III….Exercise :: Boats and Streams – Data Sufficiency 2.
| Required speed = | 1 | (12 + 4) km/hr = 8 km/hr. |
|---|---|---|
| 2 |
What would be the speed of a boat in still water if it covers a distance of 40 km in 4 hours in upstream and covers 40 km in 2 hours while going downstream?
What would be the speed of a boat in still water if it covers a distance of 40 km in 4 hours in upstream and covers 40 km in 2 hours while going downstream? Solution: From the data, upstream speed= (40/4)= 10 km/hr.
How do you measure the distance between a boat and stream?
Important Formulas – Boats and Streams speed of the stream =y = y km/hr. Let speed of a man in still water =x = x km/hr, speed of the stream =y = y km/hr, distance =d = d km.
What is boats and stream?
1) Still water: The water of a river or any other water body which is not flowing is known as still water. 2) Stream: It is the flowing water of a river which is moving at a certain speed. 3) Upstream: The boat or a swimmer moving against the stream is known as moving upstream i.e. against the flow of water.
How many km can a boatman row against the stream?
A boatman can row 2 km against the stream in 20 minutes and return in 10 minutes. Find the rate of flow of the current. Let x be the speed of man in still water and y be the speed of current.
How long does it take a boat to row 1 km?
A boat can row 1 km with stream in 10 minutes and 1 km against stream in 20 minutes. What is the speed of the boat in still water? – Quora A boat can row 1 km with stream in 10 minutes and 1 km against stream in 20 minutes. What is the speed of the boat in still water?
How do you calculate the speed of a boat upstream?
Speed of this boat upstream = (u -v) km/hr. Also, if the downstream speed is ‘a’ km/hr (suppose) and the speed upstream is b km/hr, then: Choose the correct option from the following: Q1: In one hour, a boat goes 11 km along the stream and 5 km against the stream.
How long does it take the boat to return from the stream?
One way it travels with the stream and on the return it travels against the stream. If the speed of the stream increases by 2 km/hr, the return journey takes 9 hours 20 minutes. What is the speed of the boat in still water?