Question 984733

A man travels 40 mph to his friends house. When he goes back on the same route he travels 45 mph. It was a four hour round-trip. How far did he travel
<pre>Let distance, one-way, be D
Then time taken to travel on 1<sup>st</sup> trip: {{{D/40}}}
Time taken to travel on 2<sup>nd</sup> trip: {{{D/45}}}
Since round-trip took 4 hours, then we can say that:
{{{D/40 + D/45 = 4}}}
{{{9D + 8D = 1440}}} -------- Multiplying by LCD, 360
17D = 1,440
D, or distance = {{{1440/17}}}, or {{{highlight_green(84&12/17)}}} miles