A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 11.25
Let the speed of the boat in still water = x km/h
the speed of the stream is y km/h
According to the question
The downstream speed = x + y = 35/2 = 17.5 ...(1
The upstream speed = x - y = 35/7 = 5 ........(2
After solving the equations 1 and 2
The speed of the boat in still water x = 22.5/2 = 11.25 km/h