Answer: 240 seconds OR 4 minutes
Step-by-step explanation:
Length of the train = 1 km
Length of the tunnel = 1 km
Therefore, length of the train + length of the tunnel = (1 + 1) km = 2 km 
= 2000 m
Speed of the train = 30 km/hr = 8.333 metres per second
Therefore, time taken by the train to cross the tunnel = 2000 m/ 8.333 m/sec.
= 240 seconds = 4 minutes
 
 
        
             
        
        
        
Answer:
she messed up at -17=34x
Step-by-step explanation:
she added 8x to each side but she was actually supposed to subtract
 
        
                    
             
        
        
        
Answer:
8.54400374532
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1 roll of toilet paper would cost $50 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
70 degrees
Step-by-step explanation:
Find the diagram attached 
The sum of the angles is supplementary that is
45 + 2x- 5 = 180
2x + 40 = 180
2x = 180 - 40
2x = 140
x = 140/2
x = 70
Hence the value of x is 70 degrees