Answer to Question #216031 in Mechanical Engineering for Del

Question #216031

A river flows due north with a velocity of 3kph. A man rows a boat across the river. His velocity relative to the water is 4kph due east. If the river is 1km wide, how long will it take him to cross the river? 


1
Expert's answer
2021-07-12T03:38:02-0400

The velocity of man in northward direction does not affect its speed in eastern direction which is 4km/h. 

Thus time taken = distance/speed


"\\dfrac{1\\ km}{4\\ km\/h}=\\dfrac{1}{4} \\ h=15\\ min"


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