CUET Preparation Today
A can do a piece of work in 15 days, but with the help of B, he can do it in 9 days. In what time can B do it alone? |
22.5 days 18 days 21 days 20.5 days |
22.5 days |
A = 15 days, A + B = 9 days,
⇒ A + B = 5 (Efficiency) ⇒ 3 + B = 5, ⇒ B = 2, ⇒ Time required by B to complete work alone = \(\frac{45}{2}\) = 22.5 days, ..(\(\frac{Work}{Efficiency}\) = Time) |
