Prathik was playing football with his sister. If he ran 7 times faster than her, how many feet would he have run by the time she ran only 5 feet?

Question

$\begin{array}{11} (a)\;\text{40 feet} \\ (b)\; \text{30 feet} \\ (c)\; \text{35 feet} \\ (d)\; \text{45 feet} \end{array}$