Question

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?
A) 64000 liters B) 56000 liters C) 78000 liters D) 60000 liters

Answer 1

Answer:

( B ) 56000

Step-by-step explanation:

Let quantity of petrol filled every day = x litre

Total volume = v litre

When the reservoir is full and if 40,000 litres of petrol is used daily, the supply fails in 90 days

v = (40000- x)*90

If 32,000 litres of petrol is used daily, supply fails in 60 days.

v = (32000- x)*60

(40000- x)*90 = (32000- x)*60

(40000- x)*3= (32000- x)*2

120000 - 3x = 64000 - 2x

x = 56000

Quantity of petrol filled every day = 56000 litre

Therefore 56000 litre can be used daily without supply ever failing