Question 1110375
r, the rate for one man


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9 men can unload 450kg of good in 2 hours.
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{{{9r*2=450}}}
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{{{2r=50}}}

{{{highlight_green(r=25)}}}, in kilograms per hour, the ONE-man rate.



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If after having unloaded 150kg of goods, 5 men were asked to do other jobs. 

How many more hours are needed for the remaining 4 men to unload the rest of the goods?
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Assuming the one job is still to unload 450 kilograms of goods, and that 9 men unloaded 150 kg, the remaining 4 men still have 300 kg to unload.
x, how many more hours:


{{{4*25*x=300}}}
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{{{x=300/(4*25)}}}

{{{highlight(x=3)}}}