a) 72 seconds
b) 132 seconds
c) 192 seconds
d) 252 seconds
Answer: d
Explanation: Relative speed = (45 – 40) km/hr = 5 km/hr
= $$\left( {5 \times \frac{5}{{18}}} \right)$$ m/sec
= $$\frac{{25}}{{18}}$$ m/sec
Total distance covered = Sum of lengths of trains = (200 + 150) m = 350 m
Time taken
= $$\left( {350 \times \frac{{18}}{{25}}} \right)$$ sec
= 252 seconds
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