Raman turns on the hot water pipe, which delivers water at $8.5 L / m i n$ into the bathtub. Two minutes later he also turns on the cold water pipe, which delivers water $13.0 L / m i n$ . Let Raman turned the cold water pipe for $x m i n u t e s$ .
Write an expression for the amount of water that the cold water pipe has delivered.

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Solution

Forming an expression:
Given: the speed of the hot water pipe $= 8.5 L / m i n$
the speed of the cold water pipe $= 13.0 L / m i n$
Time taken by cold water pipe to fill a bathtub $= x m i n u t e s$
The amount of water the cold water pipe has delivered $= 13.0 \times x l i t r e s$
Hence, the amount of water the cold water pipe has delivered is $13.0 x l i t r e s$ .

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