a Boat takes 7 hours to go 70 kilometre downstream and 35 kilometre upstream. It takes 7 hours to go 80 km downstream and 30 km upstream then find the speed of the boat in still water and the speed of the stream class 10th maths
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The boat covers the same distance in 4 hours while running downstream. E. km/hr = 8 km/hr. km/hr = 12 km/hr.
Time requires to travel 20 km upstream is 26.67 min .
One can row 10 km in 10 minutes in still water . The same distance in 8 minutes with the stream .
Hence upstream speed = 60 – 15 = 45 km/hr. So time taken to cover 20 km = 20/45*60 = 26.67min.
In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is: A. (11 + 5) kmph = 8 kmph.
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