two trains moving in opposite direction cover same distance "D" in 30min if the train are moving in north-south direction what will be their displacement in
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Answer:
Both identical trains have speed of xand y m/s and sum of their lengths be D
Thus, t=
(x+y)
D
=3
When speed of one is increased by 50%: t=
(1.5x+y)
D
=2.5
3x+3y=3.75x+2.5y
0.5y=0.75x
y=1.5x
D=3(x+y)=3(2.5x)=7.5x
Thus, time for train moving in same direction=
(y−x)
D
=
(1.5x−x)
7.5x
=
0.5
7.5
=15 s
Explanation:
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