A man can swim 3 km/hr. in still water of the velocity of the stream is 2 km/hr, the time taken by him to swim to a place 10 km upstream and back is- शांत जल में एक व्यक्ति की गति 2 किमी /घंटे हैं, तो धारा के प्रतिकूल 10 किमी तथा वापस आने में उसे कितने समय लगेगा?
B
Correct answer
Explanation
Wait, question has error: "swim 3 km/hr in still water" but says "velocity of stream is 2 km/hr". This is contradictory - it says swim speed is 3 km/hr, then says still water speed is 2 km/hr. Assuming swim speed = 3 km/hr (from first statement) and stream = 2 km/hr. Upstream speed = 3 - 2 = 1 km/hr, Downstream = 3 + 2 = 5 km/hr. Time = 10/1 + 10/5 = 10 + 2 = 12 hours.