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1). 54 days2). 57 days3). 60 days4). 63 days |
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Answer» Let the number of days in which B finishes the work be ‘d’ days Given, A is twice as EFFICIENT as B ∴ Number of days in whicha A finishes the work = d/2 Given, together they can do a work in 21 days In 1 DAY, they together finish 1/21th of the work ∴ 1/d + 2/d = 1/21 ⇒ 3/d = 1/21 ⇒ d = 63 days |
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