Question 419607
Write 2 equations: 1 for each trip
Let {{{d}}} = distance to her parents house
Let {{{t}}} = time to get from apartment to parents house
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apartment to parents house:
(1) {{{d = 60t}}}
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parents house to apartment:
(2) {{{d = 45*(t + 3/2)}}}
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(2) {{{d = 45t + 135/2)}}}
(2) {{{2d = 90t + 135}}}
Substitute (1) into (2)
(2) {{{2*60t = 90t + 135}}}
(2) {{{120t - 90t = 135}}}
(2) {{{30t = 135}}}
{{{t = 45}}}
{{{d = 60t}}}
Have to go- you finish