Question

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

Answer 1

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