Two trains of equal length, running in opposite directions, pass a pole in 18 and 12 seconds. The trains will cross each other in:
A. 14.4 seconds
B. 15.5 seconds
C. 18.8 seconds
D. 20.2 seconds
Answer: Option A
Solution(By Examveda Team)
Let length of each train be x meter. Then, speed of 1st train = $$\frac{x}{{18}}$$ m/sec Speed of 2nd train = $$\frac{x}{{12}}$$ m/sec Now, When both trains cross each other, time taken $$\eqalign{ & = {\frac{{2x}}{{ { {\frac{x}{{18}}} + {\frac{x}{{12}}} } }}} \cr & = \frac{{2x}}{{ {\frac{{ {2x + 3x} }}{{36}}} }} \cr & = \frac{{2x \times 36}}{{5x}} \cr & = \frac{{72}}{5} \cr & = 14.4\,\,{\text{seconds}} \cr} $$Join The Discussion
Comments ( 1 )
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
Nice explanation