A) 1 min 12 s
B) 1 min 24 s
C) 2 min 24 s
D) None of these
Correct Answer: C
Solution :
Relative speed \[=(72-60)km/h=12km/h\] \[=\left( 12\times \frac{5}{18} \right)\text{m/s}\] \[=\frac{10}{3}\text{m/s}\] Total distance covered \[=(240+240)m=480m\] Required time \[=\left( 480\times \frac{3}{10} \right)\,\,s\] \[\text{= 144 s = 2 min 24 s}\text{.}\]You need to login to perform this action.
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