A single reservoir supplies the petrol to the whole city, while the reservoir is fed by a single pipeline filling the reservoir with the stream of uniform volume. When the reservoir is full and if 40,000 liters of petrol is used daily, the suply fails in 90 days.If 32,000 liters of petrol is used daily, it fails in 60 days. How much petrol can be used daily with out the supply ever failing? Select:
A) 64000 liters
B) 56000 liters of petrol
C) 78000 liters
D) 60000 liters
E) None of these
Explanation:   Let x liter be the per day filling and v litr be the capacity of the reservoir, then   90x + v = 40000 × 90 -----(1)   60x + v= 32000 × 60 ------(2)   solving eq.(1) and (2) , we get   x = 56000   Hence , 56000 liters per day can be used without the failure of supply.   Answer: 56000 liters of petrol
<result>B</result>
A single reservoir supplies the petrol to the whole city, while the reservoir is fed by a single pipeline filling the reservoir with the stream of uniform volume. When the reservoir is full and if 40,000 liters of petrol is used daily, the suply fails in 90 days.If 32,000 liters of petrol is used daily, it fails in 60 days. How much petrol can be used daily with out the supply ever failing?