12) A train first travels 20 minutes with a velocity of 20 kmh' and then 30 minutes
with a velocity of 30kmh' in the same direction. Calculate the average veloocity
of the train.
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Answer:
ANSWER
Total time of journey =t
1
+t
2
=
60
30+40
=
6
7
h
∴ Average velocity =
Total time of journey (t)
Total distance travelled (S)
=
(7/6)h
60
30
×30+
60
40
×40
=35.71 kmh
−1
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