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Question Number 18214 by chux last updated on 16/Jul/17

The speeds of Daniel and Robert  are in the ratio of 3:4.In a race of  300m Daniel has a start of 90m.   Daniel won by?

$$\mathrm{The}\:\mathrm{speeds}\:\mathrm{of}\:\mathrm{Daniel}\:\mathrm{and}\:\mathrm{Robert} \\ $$$$\mathrm{are}\:\mathrm{in}\:\mathrm{the}\:\mathrm{ratio}\:\mathrm{of}\:\mathrm{3}:\mathrm{4}.\mathrm{In}\:\mathrm{a}\:\mathrm{race}\:\mathrm{of} \\ $$$$\mathrm{300m}\:\mathrm{Daniel}\:\mathrm{has}\:\mathrm{a}\:\mathrm{start}\:\mathrm{of}\:\mathrm{90m}.\: \\ $$$$\mathrm{Daniel}\:\mathrm{won}\:\mathrm{by}? \\ $$

Answered by ajfour last updated on 17/Jul/17

300=3ut+90   ⇒  ut=70m  300−4ut=300−280=20m.

$$\mathrm{300}=\mathrm{3ut}+\mathrm{90}\:\:\:\Rightarrow\:\:\mathrm{ut}=\mathrm{70m} \\ $$$$\mathrm{300}−\mathrm{4ut}=\mathrm{300}−\mathrm{280}=\mathrm{20m}. \\ $$

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