If a star has a large luminosity and also a low surface temperature then it must have:.

To summarize, the answer is it has a small radius.

Explanation:

This is becuase these characteristics interpert a small radius.  

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this