Ellena can read 15 pages in 10 minutes. How long will it take for her to complete the book which contains 225 pages ?

Question

$\begin{array}{1 1} (a)\; \text{100 minutes} \\ (b)\; \text{120 minutes} \\ (c)\; \text{150 minutes} \\ (d)\; \text{200 minutes} \end{array}$