\[\boxed{\mathbf{2.}}\]
\[1)\ (32 + 25) \cdot 2 = 57 \cdot 2 =\]
\[= 114\ км.\]
\[2)\ 10 + (34 + 48) \cdot 2 =\]
\[= 10 + 82 \cdot 2 = 10 + 164 =\]
\[= 174\ км.\]
\[3)\ 120 - (23 + 28) \cdot 2 =\]
\[= 120 - 51 \cdot 2 = 120 - 102 =\]
\[= 18\ км.\]
\[4)\ 50 - (28 - 23) \cdot 2 =\]
\[= 50 - 5 \cdot 2 =\]
\[= 50 - 10 = 40\ км.\]
\[5)\ 50 + (65 - 47) \cdot 2 =\]
\[= 50 + 18 \cdot 2 =\]
\[= 50 + 36 = 86\ км.\]
\[\boxed{\mathbf{3.}}\]
\[1)\ 36\ :(9 + 3) = 36\ :12 = 3\ (ч).\]
\[2)\ 44\ :(13 - 2) = 44\ :11 = 4\ (ч).\]
\[3)\ 16\ :(8 - 4) = 16\ :4 = 4\ (ч).\]