(A) 9
(B) 6
(C) 10
(D) 8
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(A) 9
(B) 6
(C) 10
(D) 8
Answer: Option (D) 8
Explanation:
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.