PLS HELP I GIVE BRAINLIES PLSSS QUICK HELP ME Brass is a metallic alloy that is made of copper and zinc. It takes 400 kg of zinc to make 1,200 kg of brass. How much copper is needed to make 450 kg of brass?

step-by-step explanation:

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may i see the picture? it would a lot, xox

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m