A second of do the same question before

 I gonna say this

One long work took me 2hours with the velocity of 1000p/H

So the same long work I gonna finishes in how many hours with a velocity of 800p/H

2h x 1000p/H = 1

X x 800p/H = 1;

Also is easy to on't miss if you notice that multiplying time by veolcity you gonna cancel the time with the time of the of the velocity and will remains the pages -> hours x pages/hours.

Rute Bezerra de Menezes Gondim