Question

5 Bruce is a very fast reader. He can readabout 40 pages in an hour. About howlong will it take him to read a 140-pagebook?

Answer 1

3 hours and 30 minutes

1) Let's assume that the speed that Bruce reads is constant. So we can write the following proportion:

`\begin{gathered} 1h----40 \\ x----140 \end{gathered}`

2) From that we can write out the following ratios and then cross multiply them:

`\begin{gathered} (1)/(x)=(40)/(140) \\ 40x=140 \\ (40x)/(40)=(140)/(40) \\ x=(7)/(2)=3.5 \end{gathered}`

Hence, it will take him 3 hours and 30 minutes