Question

A man can row 5kmph in still water.If the river is running at 1kmph,it takes him 75 minutes row to a place $ back.How far is the place

Answer 1

(5+1)x=(5-1)y

6x=4y

y=1.5x

x+y=75

2.5x=75

x=30

d=(5+1)X30=180