SOLUTION: Roy leaves for work at 7 am travelling at 40 kph. His sister Susan finds out that he has forgotten his briefcase, she leaves at 7:05 am chasing him at 50 kph. At what time Susan wi

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Question 992003: Roy leaves for work at 7 am travelling at 40 kph. His sister Susan finds out that he has forgotten his briefcase, she leaves at 7:05 am chasing him at 50 kph. At what time Susan will catch up with Roy?
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
Time interval from 7:05 AM and 7:00 AM is 5 minutes which is of an hour. RT=D relates rate, time, distance for uniform travel rates. 
Variable assignments are implied in this table.

         speed       time       distance
ROY        40        t+1/12      d
SUE        50         t          d

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