Question

Vaibhav reads 20 pages of a book in 1 1⁄2 hours with a uniform speed. How much time he will take to read 80 pages if the speed remains the same?

Answer 1

Answer: 20 pages in 1 1/2 hrs

80 pages in 4 X 1 1/2 = 6 hrs

Step-by-step explanation:

Answer 2

The time he took to read 80 pages at the same speed will be 6 hours.

Given,

Vaibhav reads 20 pages of a book in 1.5 hours with a uniform speed

To Find,

The time he took to read 80 pages at the same speed

Solution,

Speed = constant

Let the time taken in reading 80 pages be 'x' hours

Case 1 → 20 pages read in 1.5 hours

Case 2 → 80 pages read in x hours

Speed in Case 1 = $\frac{20}{1.5}$ = $\frac{40}{3}$             (1)

Speed in Case 2 = $\frac{80}{x}$                    (2)

Since speed is constant we can equate the equations (1) and (2)

$\frac{40}{3} = \frac{80}{x}$

40*x = 80*3

x =240/40

x = 6 hours

Thus, the time he will take is 6 hours.

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