You can put this solution on YOUR website! ---
s = d/t
t = d/s
d = s*t
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1st leg:
d = 80*1 = 80 km
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2nd leg:
d = 40*2 = 80 km
---
total distance:
160 km
total time:
3 hr
---
answer:
average speed:
s = 160/3
s = 53.3 km/hr
---
NOTE:
average speed is NOT:
(80 km/h + 40 km/h)/2 = 60 km/h
---
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