Question

the speed of boat/man in still water is three times than speed of current. And he can row a 48 km distance downstream in 6 hours. Find his speed in still water


please solve with shortcut method bcz I'm preparing for competitive exam​

Answer 1

Answer:

12km

Step-by-step explanation:

Speed of boat in still water = B = 3 km/hr

Speed of stream = S = 1 km/hr

Speed of boat going downstream = B + S = 3 + 1 = 4 km/hr

Speed of boat going upstream = B - S = 3 - 1 = 2 km/hr

Let the distance of the place be d.

Time taken to go to that place = Distance/Speed of boat downstream = d/4 hr

Time taken to come back from that place = Distance/Speed of boat upstream = d/2 hr

Total time taken to go and come back to that place = 9 hr

⇒ d/4 + d/2 = 9

⇒ 3d/4 = 9

⇒ d = 12 km