A) 5 min
B) 60 min
C) 20 min
D) 30 min
Correct Answer: D
Solution :
For the round trip he should cross perpendicular to the river \[\therefore \]Time for trip to that side \[=\frac{1km}{4km/hr}=0.25hr\] To come back, again he take 0.25 hr to cross the river. Total time is 30 min, he goes to the other bank and come back at the same point.
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