Question

Mary can read 22 page in 30 minutes.How long would it take her to read a 100 page book?Write your answer in hours and minutes and round to the nearest minute,if needed.

Answer 1

Mary can read 100 pages in 2 hour and 16 minutes.

Explanation:

Given:

Number of pages Mary can read = 22

Time taken to read 22 pages = 30 minutes.

We need to find time required to read 100 pages.

Solution:

We will first find time required to read 1 page.

Now we know that;

22 pages = 30 minutes

1 page = time required to read 1 page

By using Unitary method we get;

time required to read 1 page =
`(30)/(22) = 1.36 \ minutes`

Now we can say that;

1 page = 1.36 minute

100 page = time taken to read 100 pages.

Again by using Unitary method we get;

time taken to read 100 pages =
`1.36 * 100 = 136\ minutes`

Now we know that;

1 hour = 60 minutes

Number of hours in 136 minutes =136 minutes.

Again by using unitary method we get;

Number of hours in 136 minutes =
`(136)/(60)=2.26\ hrs`

Now Converting 0.26 hr into minutes we get

Now
`0.26 \ hr = 0.26 * 60 = 15.6\ min`

Now rounding 15.6 minute to nearest minute we get;

Number of hours Mary can read 100 pages =
`2\ hrs \ and \ 16 \ min`

Hence Mary can read 100 pages in 2 hour and 16 minutes.