Abigail roller skates 7 km with a constant speed of 12 km/h and another 16 km with a constant speed of 24 km/h. What is her average speed for the tota

Abigail roller skates 7 km with a constant speed of 12 km/h and another 16 km with a constant speed of 24 km/h. What is her average speed for the total trip?

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  1. Đáp án:

     11,25km/h

    Giải thích các bước giải:

     Vận tôc trung bình của cô gái trên cả quãng đường:

    (12+24)/ (1,7+1,5)=11,25km/h

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