Rama and Hari can together finish a piece of work in 15 day. Rama works twice as fast as Hari, then Hari alone can finish work in :

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Rama and Hari can together finish a piece of work in 15 day. Rama works twice as fast as Hari, then Hari alone can finish work in :

A45 days

B30 days

C25 days

D20 days

Answer:

A. 45 days

Read Explanation:

Solution:

GIVEN:

Rama and Hari together can finish a piece of work in 15 days

Rama works twice as fast as Hari

FORMULA USED:

Work = Efficiency × No. of days

CALCULATION:

Rama works twice as fast as Hari

⇒ The efficiency of Rama: Hari = 2:1

⇒ Total Work = Efficiency of (Rama + Hari) × Total number of days to finish the work

⇒ 3 × 15 = 45

⇒ No. of days required to finish whole work by Hari alone = Total work/Efficiency

⇒ 45/1 = 45

∴ Hari can finish the whole work alone in 45 Days

Alternate Method:

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