Working 5 hours per day, Ruchi can write a book in 22 days. How many hours per day should she work so as to read the same book in 11 days?

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Working 5 hours per day, Ruchi can write a book in 22 days. How many hours per day should she work so as to read the same book in 11 days?
1. 2.5 hours
2. 12 hours
3. 11 hours
4. 10 hours

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Correct Answer - Option 4 : 10 hours

Given:

The Ruchi can write a book = 22 days

The Ruchi working = 5 hours per day

Formula used:

${H_1\ × D_1\ × M_1 \over W_1}\ =\ {H_2\ × D_2\ × M_2\over W_2}$     (Where H = The hours, D = The days, M = The number of men and W = The work)

Calculation:

Let us assume he will work for X hours per day to complete the work in 11 days

⇒ 5 × 22 = X × 11

⇒ The Ruchi will work each day = X = 10 hours

∴ The required result will be 10 hours.

Work = Efficiency × Time