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A farming field can be ploughed by 6 tractors in 4 days. When 6 tractors work together, each of them ploughs 120 hectares a day. If two of the tractors were moved to another field, then the remaining 4 tractors could plough the same field in 5 days. How many hectares a day would one tractor plough then?​

 Feb 13, 2021
 #1
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144 hectares a day

 Feb 13, 2021
 #2
avatar+118755 
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Each day, the  tracrs  plough  6 * 120   =720 hectares

 

So....in  4  days.....they  must plow   4 * 720  =   2880 hectares =  size of the  field

 

When  the  two tractors are moved,  then  each  tractor  does  1 /( 5 * 4)  =  1/20  of the  work in one day

 

So       2880   / 20    = 144  hectares  / day 

 

cool cool cool

 Feb 13, 2021

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