I fill 100 box in 2 hr, Sam filll 500 same boxes in 1 hr, how long working together to fill 700 box

i fill100 box in 2 hr, he fill 500 in 1 hr, how long will it take working together to fill 700 box

 

 

 

 

 

 

 
 
 
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1 Answer

yer werk rate=100/2=50/our

his werk rate=500/our

tugether rate=550/our

time=700 boxes/550=1.272727272...ours

or bout 1 our+16 minuts
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