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2 years, 7 months ago
2 years, 7 months ago
Hi
let scheduled time be t ,
In both cases it traveled same distance :
so we get 60(t+2) = 80(t-2)
we get 60t+120 = 80t-160
we get 20t = 280
t = 14 hrs
Therefore total distance = 60(t+2) =960
Now 960 has to be covered in 14 hours
so we get average speed = 960/14 = 480/7
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