Question

varun and arun can plough a field in 12 and 18 hrs respectively .Varun ploughs the field for 4 hrs after he leaves then Arun ploughs the remaining field .how long did Arun take to plough the remaining field

Answer 1

Varun and Arun can plough a field in 12 hours and 18 hours respectively.
:work done by Varun in 1 hour is equal to 1/12th part and work done by Arun in 1 hour is equal to 1/18th part
Varun 4 hour work is equal to 4multiply 1/12 =1/3.
remaining work is equal to 1 minus 1/3=2/3.
in one hour Arun ploughs 1/18 th part,of the field
=2/3÷1/18
=2/3 * 18
=12 days..
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Answer 2

Answer:12 hrs

Step-by-step explanation:varun complete a work in 12 hrs

Arun do it in =18 hrs

A hour work of varun =1/12

A hour work of arun = 1/ 18

So 4 hrs work of varun complete 4×1/12=1/3 work

So remaining work =1-1/3=2/3 work;

Then arun join work for comoletion so,

2/3×18=12 hrs.