Question

An overhead water tank can be filled in 8 hours by 5 equal capacity pumps working together. How time will 4 such pumps take to fill it up​

Answer 1

Step-by-step explanation:

Let the volume of tank be V liters

It is given

5 Pumps take 7 hours to fill V liters

that is

5 pumps will fill V liters in 7 hours

so,

5 pumps will fill (V / 7) liters in 1 hour

1 pump will fill ( (V/7) / 5 ) liters in 1 hour

1 pump will fill V / 35 liters in 1 hour

So,

7 pumps will fill 7 (V/35) liters in 1 hour

7 pumps will fill V/5 liters in 1 hour

7 pumps will fill 5 (V/5) liters in 5 (1 hour)

7 pumps will fill V liters in 5 hours

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