A person can row 66 km downstream in 6 h and 72 km upstream in 8 h. What is the speed of the current?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 1 km/h
Let the speed of a boat be x km/h
The speed of current is y km/h
As we know,
The downstream speed of the boat = x + y = 66/6 =11
x + y = 11... (1
The upstream speed of the boat = x - y = 72/8 = 9
x - y = 9... (2
Subtracting equation 2 from equation 1
2y = 2
y = 1 km/h
Hence, the speed of the current is 1 km/h