Bank Math Master১টি পরীক্ষায় এসেছেপ্রশ্ন ২০A boat goes 10km in one hour along the stream and 4 km in one hour against the stream. What is the speed of the boat?ক7 km/hrখ6 km/hrগ5 km/hrঘ8 km/hrউত্তর দেখুন