A man swimming in a stream which flows 112km/hr finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim?
ক
412 km/hr
খ
512 km/hr
গ
712 km/hr
ঘ
312 km/hr
সঠিক উত্তর: 412 km/hr
The speed of the stream is 1.5 km/hr.