Question

54.The ratio of speed of two boats ' A ' and 'B' in still water is 5:3 respectively.The speed of the current is 8km/hr.If boat 'A takes 4.5 hours to travel 126km downstream then find the time taken by

Answer 1

Answer:

Time taken by boat B = ?

Let the constant be n.

» 126/ (5n + 8) = 4.5

» 1260 = 225n + 360

» n = 900/225

» n = 4

Now, for B

» Time = 126 / (3n + 8)

= 126 / (20)

= 6.3 hr

Answer 2

use relative velocity relation and solve