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Answer : 3 3 hrs 30 min Explanation : Answer: C) 3 hrs 30 min Explanation: Let the speed of boat and stream be x and y kmph respectively.According to question d/x y d/x-y = 5h 15m or 21/4 hrs ......(i)and 2d/x-y = 7...... (ii)From eq. (i) and (ii)2d/x y = 7/2Hence, Amith will take to row 2d km distance downstream in 7/2 hrs= 3.5 hrs= 3 hrs 30 min.

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