Two People Are Talking at a Distance of 3 $1.1 \times 10 ^ { - 7 } \mathrm {~W} / \mathrm { m } ^ { 2 }$

Two people are talking at a distance of 3.0 m from where you are, and you measure the sound intensity as $1.1 \times 10 ^ { - 7 } \mathrm {~W} / \mathrm { m } ^ { 2 }$
Another student is 4.0 m away from the talkers. Calculate a reasonable estimate for the sound intensity that the other student measures.

A) $2.5 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 }$
B) $7.8 \times 10 ^ { - 7 } \mathrm {~W} / \mathrm { m } ^ { 2 }$
C) $1.5 \times 10 ^ { - 7 } \mathrm {~W} / \mathrm { m } ^ { 2 }$
D) $8.3 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 }$
E) $6.2 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 }$