প্রশ্ন সংশোধন করুন
প্রশ্ন:
A boat goes 8 km in one hour along the stream and 2 km in one hour agaist the stream. The speed i km/hr of the stream is
A boat goes 8 km in one hour along the stream and 2 km in one hour agaist the stream. The speed i km/hr of the stream is