a) 18 sec
b) 21 sec
c) 24 sec
d) 25 sec
Answer: a
Explanation: Speed of train relative to man
= (42 – 6) kmph = 36 kmph
= $$\left( {36 \times \frac{5}{{18}}} \right)$$ m/sec
= 10 m/sec
Time taken to pass the man
= $$\frac{{180}}{{10}}$$ sec
= 18 sec
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