Q7. 
A passenger train takes two hours less for a journey of 300 km if its speed is increased by 5 km/hr from its normal speed. The normal speed is: 
A.  35 km/hr 

B.  50 km/hr 

C.  25 km/hr 

D.  30 km/hr 
Q8. 
A train covers a distance in 100 min, if it runs at a speed of 48kmph on an average. The speed at which the train must run to reduce the time of journey to 40 min will be: 
A.  30 kmph 

B.  50 kmph 

C.  80 kmph 

D.  120 kmph 
Q9. 
A good train and a passenger train are running on parallel tracks in the same direction. The driver of the goods train observes that the passenger train coming from behind overtakes and crosses his train completely in 60 sec. Whereas a passenger on the passenger train marks that he crosses the goods train in 40 sec. If the speeds of the trains be in the ratio 1:2. Find the ratio of their lengths. 
A.  $3 : 1$ 

B.  $2:1$ 

C.  $3 : 2$ 

D.  $4 : 3$ 
Q10. 
A race course is 400 m long. $A$ and $B$ run a race and $A$ wins by 5m. $B$ and $C$ run over the same course and $B$ win by 4m. $C$ and $D$ run over it and $D$ wins by 16m. If $A$ and $D$ run over it, then who would win and by how much? 
A.  $D$ by 7.2 m 

B.  $A$ by 7.2 m 

C.  $A$ by 8.4 m 

D.  $D$ by 8.4 m 