2. surcharge, extra charge, additional fee or charge Customers are not willing to pay a premium. 3. bonus, reward, prize, percentage (informal), perk (Brit. informal), boon, bounty, remuneration, recompense, perquisite Shareholders did not receive a premium on the price of their shares.
The Flash is faster, which is why he's called the fastest man alive. Impulse stated that Superman can reach 99% the speed of light. Wally West (Flash) can hit the speed of light and even beyond. The Flash has the Speed Force, that's what gives him his speed.
So, the answer to the question, who is faster, Flash or Superman, in the Silver Age, Flash is faster than Superman. But Superman has also raced other Flashes in more recent years. Here are some bonus comic covers that also feature Superman, The Flash and racing.