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16 September, 20:50

Working alone, Elisa can sweep a porch in 11 minutes. Pranav can sweep the same porch in 13 minutes. How long would it take if they worked together.

A. 5.96 Minutes

B. 5.86 Minutes

C. 5.21 Minutes

D. 4.87 Minutes

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Answers (1)
  1. 16 September, 20:58
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    Elisa, e = 11mins

    Prenav, p = 13mins

    time to complete, t

    1 = t (1/11 + 1/13) = t (24/143)

    t = 143/24 = 5.96min

    Answer is A 5.96mins
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