Question Number 95182 by i jagooll last updated on 23/May/20
Answered by mr W last updated on 23/May/20
$$\frac{\mathrm{1}}{{S}}+\frac{\mathrm{1}}{{S}+\mathrm{4}}=\frac{\mathrm{1}}{\mathrm{5}} \\ $$$${S}^{\mathrm{2}} −\mathrm{6}{S}−\mathrm{20}=\mathrm{0} \\ $$$${S}=\mathrm{3}+\sqrt{\mathrm{29}}\approx\mathrm{8}.\mathrm{4}\:{h} \\ $$
Commented by i jagooll last updated on 23/May/20
$$\mathrm{thank}\:\mathrm{you}\:\mathrm{sir} \\ $$