12. A train 120 metres long passes an electric pole in 12
seconds and another train of same length traveling in
opposite direction in 8 seconds. The speed of the second
train is
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Answer Posted / mayur
from the first part of question we can comfortably say that
the speed of first train is 10m/s(120m/12sec)..
from the second part
since the two trains are moving in opposite directions
speed of train a=10m/s
speed of train b=x m/s(just consider the magnitude)
since train a crosses b in 8 secs.that means end point of a
crosses the end point of b after 8 secs.
we ASSUME B TO BE AT REST
and a moves toward b with speed =(10+x)m/sec <relative>
therefore distance to be covered =240m
time=8secs
(10+x)=240/8;
x= 20m/sec
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