Question

1. Sarita is a voracious reader. She can read 20 pages of Harry Potter in 10 minutes. If the book has 620 pages, how long will Sarita take to finish the book, assuming she reads continuously?​

Answer 1

Sarita reads the book in 5 hours 10 minutes.

Given:

• Sarita can read 20 pages of Harry Potter in 10 minutes.

To find:

• If the book has 620 pages, how long will Sarita take to finish the book ?

Solution:

Concept to be used:

1. Apply unitaory method.
2. 1 hour = 60 minutes

Step 1:

Find time taken by reading 1 page.

As,

She reads 20 pages in 10 minutes.

So, She reads 1 page in 10/20 minutes

or

She reads 1 page in 1/2 minute.

Step 2:

Find the time taken by reading 620 pages.

Time taken by reading 620 pages= $620\times \frac{1}{2}$ minutes

or

Time taken by reading 620 pages =310 minutes

Step 3:

Convert minutes in hours, by dividing total minutes by 60

Total time taken by sarita  =(300+10) minutes

=(300/60 hours) 10minutes

Total time taken by sarita = 5 hours 10 minutes.

Thus,

5 hours 10 minutes are taken by sarita to read a book of 620 pages continuously.

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Answer 2

Given:

Sarita is a voracious reader. She can read 20 pages of Harry Potter in 10 minutes.

To Find:

If the book has 620 pages, how long will Sarita take to finish the book assuming that she is reading continuously?

Solution:

1. Sarita can read a total of 20 pages of harry potter book in 10 minutes.

2. 1 minute implies 60 seconds,

=> 10 minutes implies 60 x 10 seconds,

=> 10 minutes implies 600 seconds.

3. If it takes 600 seconds to read 20 pages then,

=> Time taken to read 1 page = 600/20 seconds,

=> Time taken to read 1 page = 30 seconds.

4. Time taken to read 1 page is 30 seconds,

=> Time taken to read 620 pages = 30 x 620 seconds,

=> Time taken to read 620 pages = 18600 seconds.

5. 18600 seconds = 18600/60 minutes = 310 minutes = 5 hours 10 minutes.

Therefore, Sarita takes a total time of 310 minutes to finish the book.