A boat covered a distance of 15 km upstream in 5 hours and a distance of 42 km downstream in 6 hours. The speed of the stream in km/h is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 2
|
Understanding Tricks |
|
Application 15/(x - y) = 5 ⇒ (x - y) = 3 .......i) and 42/(x + y) = 6 ⇒ (x + y) = 7 .......ii) |
|
Now From eq i and eq ii y = 2 means 2km/h |