Question 116076
Let us suppose that Alton is x km away.
Time taken to reach Alton driving at 66 kmph is {{{x/66}}} hours.
Time taken to reach Alton driving at 90 kmph is {{{x/90}}} hours.
Now, 40 mins. = {{{2/3}}} hours.
According to the problem,
{{{x/90 + 2/3 = x/66}}}
{{{x/66 - x/90 = 2/3}}}
{{{2x/495 = 2/3}}}
{{{x = 495/3}}}
{{{x = 165}}}
Hence, Alton is 165 km away.