To convert the flow rate from millilitres per second (ml/s) to litres per hour (l/h), follow these steps:
1. Convert millilitres to litres:
[tex]\[
\text{Rate in litres per second} = \frac{\text{Rate in millilitres per second}}{1000}
\][/tex]
Here, the rate is given as 210 ml/s.
[tex]\[
\text{Rate in litres per second} = \frac{210}{1000} = 0.21 \text{ l/s}
\][/tex]
2. Convert seconds to hours:
Since 1 hour is equal to 3600 seconds:
[tex]\[
\text{Rate in litres per hour} = \text{Rate in litres per second} \times 3600
\][/tex]
Using our rate in litres per second (0.21 l/s):
[tex]\[
\text{Rate in litres per hour} = 0.21 \times 3600 = 756 \text{ l/h}
\][/tex]
3. Round the result to 1 decimal place if necessary:
In this case, the calculated rate in litres per hour is 756, which is already an integer and does not require any rounding.
Therefore, the rate of water flow through the pipe is:
[tex]\[
\boxed{756.0 \text{ l/h}}
\][/tex]
Hence, the flow rate of 210 millilitres per second is equivalent to 756.0 litres per hour, when rounded to one decimal place.
