Hi, I have a question and I hope anyone could answer it:
A river flows due north with a velocity of 3 km/h. A man rows a boat across the river with a velocity of 4 km/h relative to water due east. (a) What is his velocity relative to the earth?(b) If the river is 1km wide, how far north of his starting point will he reach the opposite bank?(c) How long a time is required to cross the river?
Given that x=1 km thus 3x/4= 0.75 km iii The velocity of man in northward direction does not affect its speed in eastern direction which is 4km/h. Thus time taken = distance/speed ie 1/4 hrs = 15 min.