A man can row 9 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of the stream

• ক 2 km/hr.
• খ 5 km/hr.
• গ 4 km/hr.
• ঘ 3 km/hr. ✅ সঠিক উত্তর