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John can do certain work in 30 hours. If he and his son work toge...

General Basic Math Exams Quizzes MCQs Quizzes Time, Distance and Work Math Quiz

Question:
John can do certain work in 30 hours. If he and his son work together, the time taken is 20 hours. The son alone can finish the work in:

Option A):
30 hours
Option B):
60 hours
Option C):
20 hours
Option D):
50 hours

Correct Answer is Option B):
60 hours

Explanation:
Solution:
John's one hour's work = 1/30
He and his son's one hour's work = 1/20
Sons's one hour work =   1/20 - 1/30
= 3 -2/60 = 1/60

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