Two trains each 180 m in length are running on the same parallel lines in opposite directions with the speed of each 80 kmph. In what time will they cross each other completely? Choose one
A) 7.8 sec
B) 8.1 sec
C) 8.3 sec
D) 8.2 sec
E) 8.4 sec

Rationale: d = 180 m + 180 m = 360 m * 1 / 1000 = 0.36 kms rs = 80 + 80 = 160 kmph t = ( 0.36 / 160 ) * 3600 = 8.1 sec answer : b
Answer: B