Question

# Two trains with their speeds in the ratio $$3:4$$ are going in opposite directions along parallel tracks. If each takes $$3$$ seconds to cross a telegraph post, then the time taken by the trains to cross each other completely will be

A
3 sec
B
4 sec
C
7 sec
D
21 sec

Solution

## The correct option is A $$3$$ secLength of Ist train $$=3x \times.3=9x$$Length of IInd train $$=4x\times 3=12x$$Total distance $$=21x$$Speed $$=4x+3x=7x$$$$\therefore$$ time$$=\cfrac { 21x }{ 7x } =3 sec$$Mathematics

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