Answer
See the answer below.
Work Step by Step
From the given bond lengths the atomic radiuses are:
Cl: 100 pm
Br: 114 pm
I: 133 pm
Therefore the estimate for the bond lengths are:
Sn-Cl: 241 pm
Sn-Br: 255 pm
Sn-I: 274 pm
Which are relatively close to the experimental values.