In sentences like ‘The speed 10 seconds later is 3 m/s’ the amount of time is easy to specify. But what can I do if it is a complex phrase? In particular, I should like to express v(t + dt) in words, where v is speed, t is an instant and t + dt is a later instant in which dt reads ‘the amount of time it takes for the picket fence to travel 5 cm’. I cannot just squeeze this phrase in front of ‘later’, can I? Is there a phrase like ‘later BY an amount of time’?
Thank you in advance for any useful tip.