Query Detail : RBI Grade B Phase I

A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 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? Correct answer: 8:3.
Garima,   November 4th 2019,  
RBI Grade B Phase I


N = time of upstream/time of downstream = 8hrs 48min /4 hrs

= (8+ 48/60) / 4 = (8 + 4/5) / 4 = 44/5/4 = 44/20 = 11/5

So U/V = (N+1)/(N-1) = (11/5+1):(11/5-1) = 16/5 : 6/5 =16/6 = 8/3