A person can row 88 km downstream in 11 h, and 72 km upstream in 12 h. What is the speed of the current?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 1 km/h.
Let the speed of the boat be x and the speed of the current be y
Downstream speed = 88/11 = 8 km/hr = (x + y).....(1)
Upstream speed = 72/12 = 6 km/hr = (x - y).....(2)
On solving equations (1) and (2) we get,
⇒ 2x = 14
⇒ x = 7 and, y = 1
Hence, the speed of the current = 1 km/hr