Question

Two trains 90 and 110 meters long approach one another from opposite directions at 54 and 90
km/h. How long do they take to completely pass one another.
(a) 0.5 seconds (b) 2 seconds
(C) 5 seconds (d) 10 seconds​

Answer 1

Answer:

c.5 second

Step-by-step explanation:

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Answer 2

$\huge\underline\mathcal\blue{Question}$

Two trains 90 and 110 meters long approach one another from opposite directions at 54 and 90

km/h. How long do they take to completely pass one another.

$\huge\purple{\boxed{\boxed {answer }}}$

Length of the 1st train = 90m

Length of the 2nd train = 110m

Relative speed of the trains,

= 54+90= 144 km/h

$144 \times \frac{5}{18} = 40$

$time \: taken \: to \: cross \: each \: other$

$\frac{length \: of \: first \: train + length \: of \: second \: train}{reative \: speed \: of \: the \: trains}$

$= \frac{200}{40}$

$= 5 \: seconds$

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