140/v-140/v10=3/1
140*3(v+10)=3v*140+v(v+10)
v^2+10v-4200=0
V=100+16800=16900=130^2
V=-10+130/2=60
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140/v-140/v10=3/1
140*3(v+10)=3v*140+v(v+10)
v^2+10v-4200=0
V=100+16800=16900=130^2
V=-10+130/2=60