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Munagala Janardhana Reddy

· started a discussion

· 1 Months ago

solution (Question: 367537.0 )

Efficeincy (A : B ) =150 : 100 = 3 : 2
given B works whole in 30 days
then A works whole in 20 days
Now
12(1/30) + x(1/30 + 1/20 ) = 1
=> x(5/60) = 1- 2/5 = 3/5
=> x (5/12) =3
=> x = 36/5 =7.2 hrs

Question:

A can do 50% more work than B in the same time. B alone can do a piece of work in 30 hours. B starts working and had already worked for 12 hours when A joins him. How many hours should B and A work together to complete the remaining work?

Options:
A)

6 hours

B)

12 hours

C)

4.8 hours

D)

7.2 hours

Solution:

Ans: (d)

  

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