Justin's average speed for the triathlon is 15.23km/h
Average speed is the total distance covered in total time taken.
(given) 28 minutes to finish the 1500 meter swim
1.75 hours for the 40 kilometer biking portion
70 minutes for the 10 kilometer run
total distance covered = 1500m + 40 km+ 10 km
= 51500m = 51.500km
(1km = 1000m)
total time taken = 28mint + 1.75hr + 70 mint
= 203mint
time in hours = 203/60 hr
(1hour = 60 mint)
average speed = total distance covered / time taken
= 51.5 x 203/60
= 15.23km/h
Justin's average speed for the triathlon is 15.23km/h
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