A train moving at a uniform speed of 60 km/h covers a distance of 30
km. It covers another distance of 40 km at a uniform speed of 70 km /
h. Calculate the average speed of the train.
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Answer:
⇒x=60km/h
Explanation:
Let the speed of the train for next 30 km be "x".
Since, t=
s
d
So, time taken by the train for first 30 km,
t
1
=
30km/h
30km
=1h
Time taken by the train to travel next 30 km:
t
2
=
xkm/h
30km
=(30/x)h
Time taken for the entire trip:
t=
4km/h
60km
=1.5h
So, 1+
x
30
=1.5
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