Two xeroxes

The performances of the two copiers are in the ratio 3: 4. A machine with higher power will make 7,200 copies in one hour. How many copies will both machines make together in 5 hours?

Correct result:

s =  63000

Solution:

$$\begin{gathered} t=5\text{ h } \\ {h}_1=7200 \\ {h}_2:h_1=3:4 \\ {h}_2=h_1\cdot {\displaystyle \frac{3}{4}}=7200\cdot {\displaystyle \frac{3}{4}}=5400 \\ s=t\cdot (h_1+h_2)=5\cdot (7200+5400)=63000 \end{gathered}$$

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