.
Amacha leaves her office at 8:00 am and drives to
a client's office at an average rate of 80kph. She
spends 2 hours in meeting,takes a 1 hour lunch
and returns to her own office,driving at an average
of 60kph.If she arrives back at her office at 3:00 pm,
how far apart are the two offices?
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Amacha spent driving 7 hours - 3 hours = 4 hours.
Led D be the distance between the offices.
Then you have this equation for the unknown D
= 4, (1)
where 4 = 4 hours is the total driving time.
To solve (1), multiply both sides by the Least Common Denominator 240. You will have
3D + 4D = 4*240, or 7D = 960.
Hence, D = = 137.14 miles.
Solved.