Mathematics · Pipes and Cisterns
In how many minutes will a cistern be filled if three pipes with diameters 2 cm, 3 cm and 4 cm are opened together, given that the largest pipe alone can fill it in 87 minutes? (Assume the rate of flow of water through each pipe is proportional to the square of its diameter.)
- 136
- 250
- 340
- 448✓
Correct answer
48
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