Question

# A pipe supplies 30 litres of water every 10 mins. If the pipe fills a tank in 2 hours, then what is the capacity of the tank in litres?

A
400 litres
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B
354 litres
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C
360 litres
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D
300 litres
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Solution

## The correct option is C 360 litres Given, a pipe supplies 30 litres of water every 10 mins. We know that larger is the capacity of the tank, the time taken by the pipe to fill the tank will be more. So, Capacity of tank(x) ∝ time taken(y) ∴ x1y1 = x2y2 Given, x1 = 30 litres y1 = 10 mins y2 = 2 × 60 = 120 mins and x2 = capacity of the tank ∴ 3010 = x2120 ⇒ x2 = 30 × 12010 = 360 Hence, the capacity of the tank is 360 litres.

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