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1. Two workers A and B manufactured a batch of identical parts. A worked
for 2 hours and B worked for 5 hours and they did half the job. Then they
worked together for another 3 hours and they had to do (1/20)th of the
job. How much time does B take to complete the job, if he worked alone?
A) 24 hours
B) 12 hours
C) 15 hours
D) 30 hours

HI can anyone please explain how to solve this.
Answer is given as option C

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