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C 3 A molten ingot of metal cooled off 300 degrees in 40 minutes. What is the average change in temperature during this time? A. -81 degrees per minute B. -73 degrees per minute C. -61 degrees per minute D. 61 degrees per minute

C 3 A molten ingot of metal cooled off 300 degrees in 40 minutes What is the average change in temperature during this time A 81 degrees per minute B 73 degrees class=

Respuesta :

We have to divide 300 degrees by 40 minutes. The result is -7.5 degrees per minute. The equivalent mixed number is -7 1/2 which is option B.

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