Q16. 
A train 120 m in length passes a pole in 12sec and another train of length 100 m travelling in opposite direction in 10 sec. Find the speed of the second train in km per hour. 
A.  43.2 km/hr 

B.  43 km/hr 

C.  44 km/hr 

D.  43.5 km/hr 
Q17. 
A thief steals a car and drives it at 15 km/hr. The theft has been discovered after one hour and the owner of the car sets off in another car at 25 km/hr. When will the owner overtake the thief from the starting point? 
A.  1 hr 

B.  1.5 hr 

C.  2 hr 

D.  2.5 hr 
Q18. 
A tower is 61.25 m high. A rigid body is dropped from its top and at the same instant another body is thrown upwards from the bottom of the tower with such a velocity that they meet in the middle of the tower. The velocity of projection of the second body is: 
A.  24.5 m/s 

B.  20 m/s 

C.  25 m/s 

D.  22 m/s 
Q19. 
A car travels first half distance between two places with a speed of 40 km/hr and rest of the half distance with a speed of 60 km/hr. The average speed of the car is: 
A.  48 km/hr 

B.  37 km/hr 

C.  44 km/hr 

D.  45 km/hr 
Q20. 
A cyclist drove one kilometre, with the wind in his back, in three minutes and drove the same way back, against the wind in four minutes. If we assume that the cyclist always puts constant force on the pedals, how much time would it take him to drive one kilometre without wind? 
A.  \(\dfrac{7}{3}\) min 

B.  \(\dfrac{24}{7}\) min 

C.  \(\dfrac{17}{7}\) min 

D.  \(\dfrac{43}{12}\) min 