Answer:

If one page can be read in 10 mins then,

20 pages = 20 x 10 = 200

Therefore,200 mins i.e.

If one hour is 60 mins then three hours = 180 mins.Now,subtract 180 from 200=20 min.So, if the time required to read 1 page takes 10 minutes then time required to read 20 pages takes 3 hours 20 minutes which can be also written as 200 minutes

Step-by-step explanation:

Hope this helps you.