Rhotte2
20 km/hr - 5 km/hr = 15 km/hr
Wiki User
∙ 15y agoIf the boat is moving downstream, you add the speed of the boat with the speed of the river flow. Therefore, the velocity of the boat downstream is 18 km/h. If the boat is moving upstream, you subtract the river flow speed from the boat's speed, so in this case, it would be 12 km/h.
Boat WRT land, downstream 10 + 8 = 18 KMH Boat WRT land, upstream 10 - 8 = 2 KMH Boat WRT water 10 KMH
Shallow areas due to drought are the biggest obstacle to traveling by boat on the Congo River.
Shallow areas due to drought are the biggest obstacle to traveling by boat on the Congo River.
South, 1mph
The velocity of the boat relative to the shore is the vector sum of its velocity relative to the river and the velocity of the river current. In this case, it would be 4 km/h (boat's speed) + 5 km/h (current's speed), which equals 9 km/h.
The magnitude of the velocity is sqrt(32 + 42) = sqrt(9 + 16) = sqrt(25) = 5 mph. The heading of the boat is 143.1301 degrees ie 53.1301 degrees South of East. NB: 53.1301 = arctan(4/3)
assume river velocity = X mph boat velocity = 20 mph time to go 6 miles downstream = T1 time to go 3 miles upstream = T2 distance = time * velocity downstream: 6 mi = T1 * (boat velocity + river velocity) upstream: 3 mi = T2 * (boat velocity - river velocity) 6 = T1 * ( 20 + X ) 3 = T2 * ( 20 - X ) T1 * ( 20 + X ) = 2 * ( T2 * ( 20 - X ) ) since T1 = T2 then 20 + X = 40 - 2X 3X = 20 X = 6.67 thus, river velocity is 6.67mph
Leave that mark to starboard.
13.9 km hr
The resultant velocity of a boat is 17 km/hr and the direction of the boat is SW.
f a river current is 8.0 m/s, and a boat is traveling 10.0 m/s upstream, what is the boat's speed relative to the riverbank?