12 Pipes, All of the Same Size, Fill a Tank in 42 Minutes. How Long Will It Take to Fill the Same Tank, If 21 Pipes of the Same Size Are Used? - Mathematics
12 pipes, all of the same size, fill a tank in 42 minutes. How long will it take to fill the same tank, if 21 pipes of the same size are used?
Pipes: Time:: Pipes: Time
12 : 2x :: 21 : 42
∴ By inverse proportion
12 × 42 = 21 × x
= 24 minutes
Concept: Time and Work
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Chapter 10: Direct and Inverse Variations - Exercise 10 (B) [Page 123]