(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) sec = 54/5 sec = 10.8 sec.
(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) sec = 54/5 sec = 10.8 sec.
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