Question

Factory A can produce 45 machines in 20 minutes. Factory B can produce 30 machines in 15 minutes. If both factories produce machines for 2 hours, wich factory will produce more machines? How many machines will be produced?

Answer 1

Divide amount a minute by minutes so Factory A= 2.25   Factory B= 2 then multiply those by 2hrs or 120 minutes so 

Factory A = 270 and Factory B = 240
factory A produced more machines 

Answer 2

45machines:20mins
20mins=1/3hour
45machines:1/3hour
times 3
135machins=1hour
135machines per hour


B. 30 in 15
15=1/4 hour
30=1/4hour
times 4
120machines per hour

both produce for 2 hours



A. is 135*number of hours, B is 120 times number of hours
135*2+120*2=
270+240=
510

make 510 machines in 2 hours