1. The ratio between speed of a boat downstream and speed of the boat upstream is 7 : 5 respectively. If the boat travels a distance of 63 km downstream in 3 hours, what is the speed of the boat in still water ? (in km/h)






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  • By: anil on 05 May 2019 01.35 am
    Le the speed of boat be B km/hr and speed of river be R km/hr Speed of boat in downstream = (B + R) km/hr Speed of boat in upstream = (B- R)km/hr It is given that $$frac{B+R}{B-R}$$ = $$frac{7}{5}$$ B = 6R...........(1) Distance travelled downstream = 63 km Time taken = 3 hr 63 = (B+R)3 B+R = 21 ..........(2) From equation 1 and 2 R = 18 km/hr
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