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CBSE Class 10 Answered

A motor boat covers the distance between two places on a river and returns in 14 hrs if the velocity of boat in still water is 35 kmph and the e velocity of water in river is 5kmph.The distance between two places is..??

Asked by Seema.hnk | 21 May, 2019, 08:34: PM
Expert Answer
Here u = 35 and v = 5 and t = 14 
 
begin mathsize 16px style rightwards double arrow space Distance space between space the space two space places space equals space straight t open parentheses fraction numerator straight u squared space minus space straight v squared over denominator 2 straight u end fraction close parentheses
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 14 open square brackets fraction numerator open parentheses 35 close parentheses squared space minus space open parentheses 5 close parentheses squared over denominator 2 space cross times 35 end fraction close square brackets
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 14 space cross times space 1200 over denominator 2 space cross times 35 end fraction space equals space 240 space km end style
Answered by Yasmeen Khan | 22 May, 2019, 09:35: AM
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