42
                           
                           
                              
                           
                           
                           
                           
                                                      
                           
                  
                  
                  
                           
                                                                                 
                           
                              
                                                            
                                 
                                 
                                 
                              
                           
                           
                           
                           
                           
                        
                        
                     
                              Q:
                           
                           
                                                      | A) 10.30 | B) 10 | 
| C) 8.45 | D) 9.30 | 
                              Answer:   B) 10
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Assume both trains meet after x hours after 7 am
 
 Distance covered by train starting from P in x hours = 20x km
 
 Distance covered by train starting from Q in (x-1) hours = 25(x-1)
 
 Total distance = 110
 
 => 20x + 25(x-1) = 110
 
 => 45x = 135
 
 => x= 3
 
 Means, they meet after 3 hours after 7 am, ie, they meet at 10 am
 
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