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5 pumps are required to fill a tank in 90 minutes .how many pumps of the same type are used to fill the tank in 30 minutes

Sagot :

Answer: 15 pumps

More the number of pumps lesser is the time taken to fill the tank

Number of pumps ∝ 1/Time

n = k / t

[where k = constant]

In 1st case

5 = k / (1.5)

k = 7.5

In second case

n = k / t

= 7.5 / 0.5

= 15

∴ 15 pumps are used to fill the empty tank in half an hour.

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