Question 41833
Let the distance = x miles.
Then time for up journey = {{{(distance)/(speed)}}} = {{{x/50}}} hours
and time for down journey = {{{(distance)/(speed)}}} = {{{x/40}}} hours.
So total time taken during the journey = {{{x/50 + x/40}}} = {{{9x/200}}} hours.
But, given this time is 7.2 hours.
So {{{9x/200 = 7.2}}}
or {{{x = 200*(7.2/9)}}}
or x = 160


Hence the reqd. distance between the home of Mr. Jones and Disneyland is 160 miles.