A can walk a certain distance in 10 days when he rests 9 hours a day How long will he take to walk t...........

Quantitative Aptitude ( CCS) Time & distance

A can walk a certain distance in 10 days when he rests 9 hours a day. How long will he take to walk twice the distance, twice as fast and rests twice as long each day ?

4 days

10 days

15 days

25 days

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Explanation:

Working hours per day = 24 – 9 = 15
Total working hours = 15 × 10 = 150 hours
Distance is doubled and speed too. (Both cancel each other.)
New working hours (per day) = 24 – 18 = 6 hours
∴ Required time = 150/6 = 25 days