CAT 2018 Time, Speed and Distance — Previous Year Question

Every day a person walks at a constant speed, $V_1$, for $30$ minutes. On a particular day, after walking for $10$ minutes at $V_1$, he rested for $5$ minutes. He finished the remaining distance of his regular walk at a constant speed, $V_2$, in another $30$ minutes. On that day, find the ratio of $V_2$ and his average speed (i.e., total distance covered / total time taken including resting time).