1.

A and B together do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?1). 602). 303). 454). 40

Answer»

Work done by A in 1 day can be given as 1/20th of the total work

Let the work done by B in 1 day be y of the total work

From the PROBLEM statement

15 × (1/20 + y) = 1

⇒ y = 1/15 - 1/20 = 1/60

Time required by B to complete the work is 60 DAYS

Time required to complete the half work is ½ × 60 = 30 days

∴ The time required to complete half of the work is 30 days



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