Question

A machine prints four books in 10 minutes. How many books will it print in two hours?

Answer 1

Answer: 48 books

Step-by-step explanation:

A machine prints 4 books in 10 minutes.

So it will print 4*6 books in 1 hour.       [ 10*6=60 minutes = 1 hr]

So in 2 hours it will print 4*6*2 books which is 24*2=48 books.

Answer 2

Answer:

48 books

Step-by-step explanation:

Given,

Number of books printed by machine in 10 minutes = 4

Then by using unitary method, we get,

=> Number of books printed by machine in 1 minute = 4/10 = 2/5

We know that,

1 hour = 60 minutes

2 hour = 2 × 60 = 120 minutes

Then,

Number of books printed in 120 minutes = 2/5 × 120 = 2 × 24 = 48

Hence, 48 books can be printed in 2 hours.