navodaya Exam Numerical Ability Time Distance and Speed

A is driving along a highway at a speed of 90 km/hr .He is passed by B who is driving on the same highway in the same direction at a constant speed .Twelve seconds after B passes A ,their cars are 100 m apart.The speed of B's car ,in km/hr,is

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120 km/hr

Let B's speed be 'b' km/hr, then their relative speed=(b-90)
Distance between them in 12 sec. = (b-90)*12/3600 = 100/1000
=> b-90 = 30
=> b = 120 km/hr
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