The train travel the speed of 60km/h for 0.52 hours at 30km/h of the next 0.24 hours and then ar 70km/h or the next 0.71 hours. What is the average speed of the train?
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Explanation:
distance 1 = 60km/h
time 1. = 0.52km/h
distance 2 = 30km/h
time 2. = 0.24km/h
distance 3 = 70km/h
time 3. = 0.71km/h
total distance = 60+30 +70
= 160km/h
total time. = 0.52+0.24+0.71
= 1.47h
average speed = total distance / total time
= 160 / 1.47
average speed = 108.84km/h
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