Question #8cbb9

1 Answer
Deepak G.
Jan 9, 2018

#17.66# km/h

Explanation:

Time taken for David to Skate #50# km #=50/24=2.0833# Hours

Time taken for David to Skate #28# km #=28/12=2.3333# Hours

Therefore Average speed of the Total Length i.e.#50+28=78# km #=78/(50/24+28/12)=17.66# km/h

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