The speed of boat in still water is 48 kmph. If it takes 5 hour to go upstream 40 kms, in what time approximately will it return same distance downstream?
Distance = 40 km Time taken to go upstream = 5 hour ∴ Speed upstream = 40/5 = 8 km/hr ∴ Speed of the current = 48 – 8 = 40 km/hr ∴ Speed downstream = 48 + 40 = 88 km/hr ∴ Time taken to go downstream = 40/88 = 5/11 hr ⇒ 5/11 x 60 minutes = 27 minutes approx..
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