When the air-conditioner is on, a typist can type X pages per hour. However, whe

Question

When the air-conditioner is on, a typist can type X pages per hour. However, when the air-conditioner is off, she can type at

65 %

of the earlier efficiency (when the air-conditioner is on). How many hours would she take to type out 575 pages when the air-conditioner is off?

Options:

A . 375.4 X

B . 884.6X−1

C . 454.3X−1

D . None of these

Answer: Option B
:
B
Let X=100, Then when AC is off, speed = 65 pages per hour.
Thus to type 575 pages, she takes

\frac{575}{65} = 8.84

pages per hour. Answer is option (b
Alternatively:
When the air-conditioner is off, 0.65X pages are typed per hour. 575 pages will be typed in

\frac{575}{0.65 X} = 884.6 X^{- 1}

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