a) 36 kmph
b) 45 kmph
c) 50 kmph
d) 54 kmph
Answer: d
Explanation: Speed of first train = $$\frac{{150}}{{15}}$$ m/sec = 10 m/sec
Let the speed of second train be x m/sec
Relative speed = (10 + x) m/sec
$$\frac{{300}}{{10 + {\text{x}}}}$$ = 12
300 = 120 + 12x
12x = 180
x = $$\frac{{180}}{{12}}$$ = 15 m/sec
Hence, speed of other train = $$\left( {15 \times \frac{{18}}{5}} \right)$$ kmph
= 54 kmph
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