# A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downstream in 6 $1\over2$ hours. The speed of the current is â€“

 [ A ]    1 km/hr [ B ]    2 km/hr [ C ]    1.5 km/hr [ D ]    2.5 km/hr
 Answer : Option B Explanation :