Shahrukh starts from Barabanki to Fatehpur, 1 hour after Ajay starts. Shahrukh meets Kajol 1.5 hours after Shahrukh starts. If the speed of Shahrukh is at least 20km/h faster than the speed of Kajol.
What is the minimum speed of Shahrukh to overtake Ajay, before he meets Kajol?
Answer with explanationAnswer: Option D
Let t be the time after Kajol starts, when she meets Ajay, then
t = 300/(x+y)
This should be less than 2.5 or (x+y) > 120
Since, y= 3x/2 => y > 72
This (y>72) is greater than 67.5 km/h and
hence Shahrukh will always overtake Ajay before he meets Kajol.
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