1 .	Two trains 105 metres and 90 metres long, run at the speeds of 45 km/hr and 72 km/hr respectively, in opposite directions. The time which they take to cross each other, is –
[ A ]    8 seconds [ B ]    6 seconds [ C ]    7 seconds [ D ]    5 seconds
Answer : Option B Explanation : Total distance to be covered = 105 + 90 = 195 m Relative speed = (45 + 72) km/hr = 117 km/hr = (117 x $5\over 18$)m/s = $65\over2$ m/s So, time required to cross each other = 195 $2\over 65$ = 6 sec
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