Question #8cbb9

1 Answer
Jan 9, 2018

17.66 km/h

Explanation:

Time taken for David to Skate 50 km =5024=2.0833 Hours

Time taken for David to Skate 28 km =2812=2.3333 Hours

Therefore Average speed of the Total Length i.e.50+28=78 km =785024+2812=17.66 km/h