Question

$10$ pipes fill a tank in $3$ hours. How many pipes are required to fill it in $2$ hours?

• A. $15$
• B. $25$
• C. $30$
• D. $18$

Answer 1

The correct option is A $15$

This is an example is of inverse proportion

No. of pipes Time taken

$10$ $3$ hours

$x$ $2$ hours

By inverse proportion,

$10\times 3=x\times 2$

$\therefore x=\frac{10\times 3}{2}$

$\therefore x=15$

Hence the answer is option A