In a river flowing at 7 kmph, a boat travels 40 km upstream and then returns downstream to the starting point. If its speed in still water is 3kmph, find the total journey time.

13 hours

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14 hours

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15 hours

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16 hours

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Solution

The correct option is B 14 hours
Speed of the boat in still water = 3kmph
Speed of the stream = 7 kmph
Speed downstream = 3+7 = 10 kmph
Speed upstream = 7 – 3 = 4 kmph
Total journey time = (40km/10kmph) + (40km/4 kmph) = 4hrs + 10hrs = 14 hrs

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In a river flowing at 7 kmph, a boat travels 40 km upstream and then returns downstream to the starting point. If its speed in still water is 3kmph, find the total journey time.

The correct option is B 14 hoursSpeed of the boat in still water = 3kmph Speed of the stream = 7 kmph Speed downstream = 3+7 = 10 kmph Speed upstream = 7 – 3 = 4 kmph Total journey time = (40km/10kmph) + (40km/4 kmph) = 4hrs + 10hrs = 14 hrs

The correct option is B 14 hours
Speed of the boat in still water = 3kmph
Speed of the stream = 7 kmph
Speed downstream = 3+7 = 10 kmph
Speed upstream = 7 – 3 = 4 kmph
Total journey time = (40km/10kmph) + (40km/4 kmph) = 4hrs + 10hrs = 14 hrs