Question 128621
Try this:
{{{t = k/r}}} Now you need to find the value of k, the constant of variation.  Substitute the given values of r = 55mph and t = 5hr.
{{{5 = k/(55)}}} Multiply both sides by 55.
{{{275 = k}}} Now rewrite the variation as:
{{{t = 275/r}}} Substitute r = 40mph
{{{t = 275/40}}}
{{{t = 6.875}}}hours or t = 6 hours and 52.5 minutes.