How long will it take to row 20 km upstream if one can row 10 km in 10 minutes in still water and the same distance in 8 Minuteswith the stream?

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 . Let , speed of stream be u and speed of boat is v .

How fast can you row upstream?

An average kayaker can travel around 3 miles per hour with a maximum speed of around 5 or 6 miles per hour in average conditions, so keep that in mind when you read the river.

How do you solve upstream and downstream questions?

Upstream and Downstream – Formula

1. Upstream = (u−v) km/hr, where “u” is the speed of the boat in still water and “v” is the speed of the stream.
2. Downstream = (u+v)Km/hr, where “u” is the speed of the boat in still water and “v” is the speed of the stream.
3. Speed of Boat in Still Water = ½ (Downstream Speed + Upstream Speed)

What is faster upstream speed or downstream speed?

In the downstream motion, the boat and the water move in the same direction and thus the speed is more than what it will be when the two are moving opposite to each other. In other words, the upstream motion is slower. A man sitting in the boat will feel that the boat is moving but the water is still.

What is downstream and upstream speed?

The speed of boat downstream is equal to the sum of the speed of the boat in still water and speed of the stream . The speed of boat upstream is equal to the difference of the speed of the boat in still water and speed of the stream .Hence : Speed Downstream = B + S km/hr.

What is the speed of the boat downstream?

In water, the direction along the stream is called 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.

How long would it take to go 85 km If speed is 20 km per hour?

They take 4.25 hours to complete 85 km.

How long will a boat take to go a distance of 10km if the boat travel about 4 km in one hour?

(a) Boat travels in 1 hour= 4km. The boat will travel in half hour 4/2 = 2 So the boat will travel in 10km. =2 and a half hour.

How is upstream speed calculated?

How do you calculate upstream velocity?

From the basic formula for the speed we have, speed = Distance/Time or in other words we can say that Time = Distance/speed. We have the Distance for the journey = 81 km. Now we have to find the speed of the boat upstream. The upstream speed is = b – r = 13 – 4 = 9 km /hr.

What is downstream speed?

Downstream – If the boat is flowing along the direction of the stream, it is called downstream. In this case, the net speed of the boat is called downstream speed.