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
Similar Practice Questions
Two trains having lengths of 170 m and 480
Two trains having lengths of 170 m and 480 m are running at speeds of...
A gun is fired at a distance of 1.35 km
A gun is fired at a distance of 1.35 km from Mukul. She hears the...
Two trains, Train A and Train B, 58 seconds
Two trains, Train A and Train B, are running on parallel tracks in the same...
A woman travelled at a speed of 20 m/min
A woman travelled at a speed of 20 m/min for 90 min, and at a...
Pipe X can fill a tank in 60 hours while pipe Y can fill the tank in 72 hours. Both pipes are opened together for 20 hours. How much of the tank is left empty ?
Pipe X can fill a tank in 60 hours while pipe Y can fill the...
A man driving a car at a speed of 99 km/hr crosses a bridge in 1.2 minutes. Find the length (in metres) of the bridge.
A man driving a car at a speed of 99 km/hr crosses a bridge in...
A man goes to Ahmedabad
A man goes to Ahmedabad from Kolkata at a speed of 78km/hr and returns to...