The cost of fuel running the engine of an army tank is proportional to the square of the speed and R...........

Quantitative Aptitude ( CCS) Time & distance

The cost of fuel running the engine of an army tank is proportional to the square of the speed and Rs. 64 per hour for a speed of 16 kmph. Other costs amount to Rs. 400 per hour. The tank has to make a journey of 400 km at a constant speed. - Ravi can walk a certain distance in 40 days when he rests 9 hours a day. How long will he take to walk twice the distance, twice as fast and rest twdce as long each day ?

40 days

80 days

50 days

100 days

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Explanation:

[Tricky approach]
Working hours per day = 24 – 9 = 15 hours
Total time = 15 × 40 = 600 hours
Decrease in walking hours per day after increase in hours of rest
= 24 – (2 × 9) = 6 hours
Required time = 600/6 = 100 days