Q21. 
Arun, Barun and Kiranmala start from the same place and travel in the same direction at speeds of 30, 40 and 60 km per hour respectively. Barun starts two hours after Arun. If Barun and Kiranmala overtake Arun at the same instant, how many hours after Arun did Kiranmala start? 
A.  3.0 

B.  3.5 

C.  4.0 

D.  4.5 
Q22. 
Karan and Arjun run a 100meter race, where Karan beats Arjun 10 metres. To do a favour to Arjun, Karan starts 10 metres behind the starting line in a second 100 metre race. They both run at their earlier speeds. Which of the following is true in connection with the second race? 
A.  Karan and Arjun reach the finishing line simultaneously 

B.  Arjun beats Karan by 1 metre 

C.  Arjun beats Karan by 11 metres 

D.  Karan beats Arjun by 1 metre 
Q24. 
Two boats, traveling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance of 20 kms from each other. How far apart are they (in kms) one minute before they collide? 
A.  \(\dfrac{1}{12}\) 

B.  \(\dfrac{1}{6}\) 

C.  \(\dfrac{1}{4}\) 

D.  \(\dfrac{1}{3}\) 
Q25. 
A bus overtakes two boys who are walking in the direction of the bus at 2 km/hr and 4 km/hr in 9 sec and 10 sec respectively. The length of the bus and its speed are: 
A.  $50$ m and \(\dfrac{55}{9}\) m/s 

B.  $80$ m and \(\dfrac{88}{9}\) m/s 

C.  $70$ m and \(\dfrac{77}{9}\) m/s 

D.  $60$ m and \(\dfrac{66}{9}\) m/s 