suWahomanalo6pe suWahomanalo6pe

23-09-2016
Mathematics

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me. lopez drives 40 miles to her sister's house. her average speed is 20 miles per hour. on her way home her average speed is 40 miles per hour. what is her average speed for the round trip?

Respuesta :

nobillionaireNobley nobillionaireNobley

25-09-2016

Total distance = 2(40 miles) = 80 miles
Total time = 40/20 + 40/40 = 2 + 1 = 3 hours

Average speed = total distance/Total time = 80 miles/3 hours = 26.67 miles per hour.

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