1.

A tap having a diameter d can empty a tank in 60 min. How long another tap having diameter 2d take to empty the same tank?1. 12 min2. 8 min3. 10 min4. 15 min5. None of these

Answer» Correct Answer - Option 4 : 15 min

Given:

A tap having a diameter d can empty a tank in 60 min

Calculation:

The area of a tap is proportional to Work done by pipe

When the diameter is double, then the area will be four times. So, will work four times faster

Hence required time taken to empty the tank = 60 × 1/4

⇒ 15 mins

∴ The required answer is 15 mins. 



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