Answer :

If water required for 1 person per day = 75 l

Then water required for 5000 people per day = 75 × 5000 = 375000 l


= 375000 × 0.001 m3


= 375 m3


(as 1 liter = 0.001 m3)


Given, dimensions of overhead tank = 40 m × 25 m × 15 m


Volume of tank = 40 × 25 × 15 = 15000 m3


Days till the water if this tank will last = (volume of tank)/(water consumed by 5000 people per day)


= 15000/375


= 40


Thus, the water of this tank will last till 40 days.


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