Question

Sara, Kim, and John own a painting company. To paint a particular home, Sara estimates it would take her 4 days. Kim estimates 5.5 days. John estimates 6 days. How long would it take them to work together to paint the house.

Answer 1

1.67 days

Explanation:

Sara can finish 1/4 work a day

Kim can finish 1/5.5 work a day

John can finish 1/6 work a day

if they work together one day can do: 1/4 + 1/5.5 + 1/6 = 79/132

79/132 * x days = 1

x = 132/79 = 1.67