A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it take 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?  Pick: A) 1 : 3 B) 3 : 8 C) 6 : 3 D) 8 : 3 E) none

Rationale: "sol . let the man rate upstream be x kmph and that downstream be y kmph . then , distance coverd upstream in 8 hrs 48 min . = distance coverd downstream in 4 hrs . ⇒ [ x 8 4 / 5 ] = ( y * 4 ) ⇒ 44 / 5 x = 4 y ⇒ y = 11 / 5 x . ∴ required ratio = [ y + x / 2 ] : [ 6 x / 5 * 1 / 2 ] : [ 6 x / 5 * 1 / 2 ] = 8 / 5 : 3 / 5 = 8 : 3 . answer d"
Answer: D