1. The respective ratio between speed of the boat upstream and speed of the boat downstream is 3 : 4. What is the speed of the boat in still water if it covers 70 km downstream in 3 hours 30 minutes? (in km/h)






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  • By: anil on 05 May 2019 01.36 am
    Let the speed of boat in still water and speed of river be B km/hr and R km/hr respectively Speed of boat in downstream = (B+R)km/hr Speed of boat in upstream = (B-R) km/hr
    It is given that $$frac{B-R}{B+R} = frac{3}{4}$$ we get , B = 7 R Now it is given that boat covers 70 km in 3.5 hours downstream so , 70 = (B+R)3.5 B+R = 20 R = 2.5 km/hr B = 17.5 km/hr
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