Correct Answer: Option D
Relative speed = (60 + 40) km/hr = (100 x (5/18)) m/sec
= (250/9) m/sec.
Distance covered in crossing each other = (140 + 160) m
= 300 m.
Required time = (300 x (9/250) sec.
=(54/5) sec
= 10.8 sec.
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