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Question
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in :
20 days
22.5 days
25 days
30 days
15 days
ANSWER : 2
Descrption
<p>Let, A can finish the job in x days</p> <p>B can finish the job in 3x days.</p> <p>According to the question</p> <p>3x - x = 60 </p> <p>2x = 60 </p> <p>x = 30 days</p> <p>B can finish the job in 3 × 30 or, 90 days</p> <p>In 1 day A can finish 1/30 th job</p> <p>In 1 day B can finish 1/90 th job</p> <p>In 1 day both A and B can finish 1/30 + 1/90 th job</p> <p> = 3 + 1 /90 = 2/45 th</p> <p>both A and B can finish the job in 1/2/45 = 22.5 days. </p>
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