Two identical bodies, projected with the same speed at two different angles cover the same horizontal range R. If the time of flight of these bodies…

Two identical bodies, projected with the same speed at two different angles cover the same horizontal range $\displaystyle R$. If the time of flight of these bodies are $\displaystyle 5$ s and $\displaystyle 10$ s, respectively, then the value of $\displaystyle R$ is $\displaystyle \_\_\_\_$ m. (Take $\displaystyle g=10 \mathrm{~m} / \mathrm{s}^2$ )