A. 9
B. 9.6
C. 10
D. 10.8
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) ] m/sec = (54/5) sec = 10.8 sec
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