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?  Choose the correct choice from the following options
A) 32 B) 21 C) 27 D) None of these E) 18
Explanation:   Let t be the time after Kajol starts, when she meets Ajay, then   \inline t=\frac{300}{(x+y)}   This should be less than 2.5 or (x+y)&gt;120   Since y= \inline \frac{3x}{2} \inline \Rightarrow y&gt;72   This (y&gt;72) is greater than 67.5 km/h and hence Shahrukh will always overtake Ajay before he meets Kajol.   Answer: None of these
<result>D</result>
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?