Question 1055676
<pre>
                   SPEED       TIME       DISTANCE
POS                  45         t+1
NEG                  60          t
TOTAL                                      200
</pre>

<pre>
                   SPEED       TIME       DISTANCE
POS                  45         t+1       45(t+1)
NEG                  60          t         60t
TOTAL                                      200
</pre>


You are looking for t+1.
{{{45(t+1)+60t=200}}}