Question

A man can row 12 kilometre/hour in still water if the speed of the current is 3 kilometre/hour he takes 4 hours more in upstream than in the down stream.what is the distance( in kilometre)?​

Answer 1

Answer:

90km

Step-by-step explanation:

let distance = d

speed of man  x=12

speed of current y = 3

speed of man in down stream = x+y = 15

speed of man in upstream = x-y = 9

now d/9-d/15 =4

  5d-3d/45 = 4

2d=45*4

d=90km