A) 5 s
B) 6 s
C) 7 s
D) 8 s
Correct Answer: B
Solution :
[b] Sum of the length of the trains \[=(105+90)\,m=195\,m\] Relative speed \[=(72+45)\,km/h\] \[=117\text{ }km/h\] \[=\left( 117\times \frac{5}{18} \right)\,m/s=\frac{585}{18}\,m/s.\] Required time\[=\left( 195\times \frac{18}{585} \right)\,s\] \[=6\,s\] |
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