Hi there!
The answer would be A. m = 45h 
Hope this helps
        
                    
             
        
        
        
Shouldn't this be in the language section? But okay. I would say the simple subject would be "plane"
        
             
        
        
        
Answer:
a) 5:3
b) 7.5:5.3
Step-by-step explanation:
150min : 90min (1 and a half hour)
10 : 6
5 : 3
150 × 10 mm : 1060 mm
1500 : 1060
750 : 530
7.5 : 5.3