Question
A boats man can row in still water at speed of 7 km/hr. It takes 6 hours more to travel the same distance in upstream than in downstream if the speed of the river is 3 km/hr. what is the distance between the two destinations?
Answer: Option B
X = 7 KM/HR ; Y = 3 KM/HR
DS = 10 KM/HR ; US = 4 KM/HR
DISTANCE (D) IS SAME. THEREFORE, IF TIME TAKEN FOR DOWNSTREAM IS T HOURS, THE TIME FOR UPSTREAM IS (T + 6) HOURS.
10*T = 4*(T + 6)
6T = 24 ; T = 4 HOURS
D = 10*4 = 40 KM
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X = 7 KM/HR ; Y = 3 KM/HR
DS = 10 KM/HR ; US = 4 KM/HR
DISTANCE (D) IS SAME. THEREFORE, IF TIME TAKEN FOR DOWNSTREAM IS T HOURS, THE TIME FOR UPSTREAM IS (T + 6) HOURS.
10*T = 4*(T + 6)
6T = 24 ; T = 4 HOURS
D = 10*4 = 40 KM
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