How do I calculate a time (in nanoseconds) given a 90% increase in speed from 50 nanoseconds?

Question

Clarification: The new value is meant to represent the time that is 90% faster than the original time of 50 ns. There is no other information that is part of the question, it is just a matter of finding what time is 90% quicker than 50 ns.

Answer 1

I think you need to rephrase your question, since it's a little muddled.

Nanoseconds are a unit of time. Speed is measured in units of velocity per time.

Now, if you're talking about how long it would take to travel the same distance if the speed was increased, this question can make some sense. We don't know what the speed or the distance is, but we know it takes 50 nanoseconds to get there. So, if we travel 90% faster, we're going at 190% of the original speed. And 50/1.9 = 26.3 nanoseconds (to 3 significant figures). Maybe that's the answer you're looking for.

Answer 2

Think about shopping - what is a 90% discount off a price of $50?