A) 70 sec
B) 72 sec
C) 90 sec
D) 80 sec
Correct Answer: B
Solution :
Total distance \[=\text{ }160\text{ }+\text{ }140\text{ }=\text{ }300\]m Since the train are running in the same direction Relative speed \[=60-45\] =15 Km/hr \[=15\,\,\,\,\,\frac{5}{18}\] \[=\frac{25}{6}\] m/sec. Total taken to cross \[=\frac{300}{\frac{25}{6}}=\frac{300\,\,\,\,\,6}{25}=72\] secYou need to login to perform this action.
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