Which best describes the reasonableness of their solution?

Option A

Their estimate time is longer than time it will actually take.

Step-by-step explanation:

Given that,

number of hours Sandra takes to mow lawn = 45 minutes

                                                                                 = 0.75 hours

number of hours Kelly takes to mow lawn = 1 hour 15 minutes

                                                                             = 1.25 hours

Estimate time to mow lawn if both works together = 1 hour

1.25 + 0.75 /(1.25)(0.75)

2 / (1.25)(0.75)  

(for complete work take reciprocal)

(1.25)(0.75) / 2

0.47 hours < 1

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exactly you go it

step-by-step explanation: