19
A boat travels 60 kilometers downstream and 20 kilometers upstream in 4 hours. The same boat travels 40 kilometers downstream and 40 kilometers upstream in 6 hours. What is the speed (in km/hr) of the stream?
- A24
- B16
- C18
- D20
Answer not set
Discussion 1
Log in or create a free account to reply and vote.
0
CCommunity
60/(x + y) + 20/(x - y) = 4
40/(x + y) + 40/(x - y) = 6
∴ On solving,
x + y = 40
x- y = 8
Speed of stream, y = 16
40/(x + y) + 40/(x - y) = 6
∴ On solving,
x + y = 40
x- y = 8
Speed of stream, y = 16