Question

Azhar can row 9.333 kmph in still waters and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The speed of the current of the river is

Options

• 3. 333 km/hr

• 3.111 km/hr

• 4.666 km/hr

• 4.5 km/hr

Answer 1

4.666 km/hr

Explanation:

Speed = x = 9.333 km/h = `28/3`km/h
up time = 3 times of down time

`"D"/("x"-"y")=(3xx"D")/("x"+"y")`

x + y = 3x − 3y

`"y"="x"/2=28/(3xx2)=14/3`

= 4.666 km/h