[tex]\begin{gathered} \text{Divide first the total 65.10 tons of garbage, by the rate the garbage could be burned} \\ \Rightarrow\frac{65.10\text{ tons}}{4.2\text{ tons/hour}}=15.5\text{ hours} \\ \text{Next, convert the decimal place of the hours into minutes} \\ 0.5\text{ hours}\rightarrow0.5\text{ hours}\times\frac{60\text{ minutes}}{1\text{ hour}}\rightarrow30\text{ minutes} \\ \text{that means that the 65.10 tons of garbage will be burned in 15 hours and 30 minutes} \\ \text{Add that to the start time, 7:25} \\ \text{separately add the hours and minutes} \\ 7+15=22 \\ 25+30=55 \\ \text{Therefore, the time for which all of it is burned is 22:55.} \end{gathered}[/tex]
