$(\mathrm{Speed}M)=2(\mathrm{Speed}J)\phantom{\rule{0ex}{0ex}}T\mathrm{is}\mathrm{time}\mathrm{travelled}\mathrm{by}J\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{For}J\mathrm{to}\mathrm{mid}\mathrm{point}\phantom{\rule{0ex}{0ex}}\mathrm{Speed}J=\frac{270}{T}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{For}M\mathrm{to}1/3\mathrm{point}\phantom{\rule{0ex}{0ex}}\mathrm{Speed}M=\frac{180}{T10}\phantom{\rule{0ex}{0ex}}2(\mathrm{Speed}J)=\frac{180}{T10}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{From}\mathrm{here}\mathrm{you}\mathrm{can}\mathrm{find}T\mathrm{and}\mathrm{the}\mathrm{rest}.\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}$ 


