A boat travels 30km upstream in the same amount if time It takes travel 60km
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Let the speed of boat be (x-4) in upstream and (x+4) in downstream
s=d/t ,t= d/s
30/4= 7.5 hours
60/4= 15 hours
then the equation will be
7.5(x+4)=15(x-4)
7.5x + 30 +=15x - 60
+30+60=15x- 7.5x
90=7.5x
x=90/7.5
=12
answer is 12 kmph.
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