The speed of boat in still water is 10km/h. it can go 30 km upstream and return downstream to original point in 8 hours . what is speed of stream in km/h?
Answers
Answered by
0
Answer:
5
Step-by-step explanation:
30/(10+y) + 30/(10-y) = 8
30 ( 20)= 800 - 8y^2
8y^2 = 200 => y^2 = 25
y = 5 km/hr
Similar questions