SOLUTION: Shawna left the hospital and traveled toward the ferry office at an average speed of 30 km/h . Shreya left one hour later and traveled in the same direction but with an average spe

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Question 1184643: Shawna left the hospital and traveled toward the ferry office at an average speed of 30 km/h . Shreya left one hour later and traveled in the same direction but with an average speed of 40 km/h . How long did Shawna travel before Shreya caught up ?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
           SPEED       TIME      DISTANCE

Shawna       30         d/30        d

Shreya       40         d/40        d

Difference               1

d%2F30-d%2F40=1
Solve for d. Evaluate d%2F30.
.
.
d=120
and
d%2F30=120%2F30=highlight%284%29