SOLUTION: A boat travels 2km upstream and 2km back. the time for the round trip is 10 hours. the speed of the stream is 5km/hr whats the speed of the boat in still water?
Algebra.Com
Question 982837: A boat travels 2km upstream and 2km back. the time for the round trip is 10 hours. the speed of the stream is 5km/hr whats the speed of the boat in still water?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A boat travels 2km upstream and 2km back. the time for the round trip is 10 hours. the speed of the stream is 5km/hr whats the speed of the boat in still water?
----------
Avg speed of the round trip = 4/10 = 0.4 km/hr
---
B = boat's speed
U = speed upstream = B-5 km/hr
D = speed downstream = B+5 km/r
---
Avg speed = 2*U*D/(U+D)
2(B-5)*(B+5)/2B = 0.4
B^2 - 25 = 0.4B
5B^2 - 2B - 125 = 0
-----
B =~ 5.204 km/hr
RELATED QUESTIONS
A boat travels 3km upstream and 3km back. the time for the round trip is 10 hours. the... (answered by mananth)
A boat travels 2 km upstream and 2km back. The time for the round trip is 4hrs. The speed (answered by stanbon)
A boat travels 9km upstream and 9km back. The time round trip takes 10hrs. The speed of (answered by MLipsky)
A boat travels 2 km upstream and 2km back. The time for the round trip is 8hrs. The speed (answered by josmiceli)
A BOAT TRAVELS 8KM UPSTREAM AND 8KM BACK. TIME FOR THE ROUND TRIP IS 9HRS. THE SPEED OF... (answered by galactus)
A boat travels 10km upstream and 10km back. The time for the roundtrip is 5 hours. The... (answered by mananth)
A boat travels 10 km upstream and 10 km back. The time for the round trip is 10 hours.... (answered by mananth)
A boat travels 1 km upstream and 1km back. The time for the round trip is 10 hours.... (answered by scott8148)
A boat travels 7 km upstream and 7km back. The time for the round trip is 10 hours. The... (answered by mananth)