The speed of a boat is still water is 13 km/h
The speed of a boat is still water is 13 km/h and the speed of the stream is 4 km/h. How much more time will it take in going upstream than Ingoing downstream a distance of 68 km? (Correct to the nearest minute)
स्थिर जल में एक नाव की चाल 13 km/h है और धारा की चाल 4 km/h है। 68 km की दूरी धारा की दिशा में तय करने में लगने वाले समय की तुलना में धारा की विपरीत दिशा में समान दूरी तय करने में उसे कितना अधिक समय लगेगा? (निकटतम मिनट तक सही)
Detailed Solution & Logic
3 h 33 min
Speed of boat in still water = 13 km/h
Speed of stream = 4 km/h
Upstream speed = 13 - 4 = 9 km/h
Downstream speed = 13 + 4 = 17 km/h
Distance = 68 km
Time taken upstream = $ \dfrac{68}{9} $ = 7.56 h
Time taken downstream = $ \dfrac{68}{17} $= 4 h
Difference in time = 7.56 - 4 = 3.56 h
$ 0.56 \times 60 $ = 33.6 minutes 33 minutes
Required time difference = 3 h 33 min
Correct answer: 3 h 33 min
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