A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of the stream.

A.

2 km/hr

B.

2.5 km/hr

C.

1.5 km/hr

D.

1.75 km/hr

• Given, Speed of Boat (B) = 4.5 kmph , Speed of River(R) = ?
  Downstream(D) = 2 * (Upstream(U)).
  Therefore, D = 2 U
  B+R = 2 * B-R
  finally, B = 3 R [ given ,B = 4.5kmph]
  R = 4.5/3 ---> R = 1.5 kmph.
• 6 years agoHelpfull: Yes(2) No(1)