SOLUTION: Kathryn left the mall and drove toward the lake at an average speed of 52km/h. Jenny left three hours later and drove in the opposite direction with an average speed of 60km/h. How
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-> SOLUTION: Kathryn left the mall and drove toward the lake at an average speed of 52km/h. Jenny left three hours later and drove in the opposite direction with an average speed of 60km/h. How
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Question 1142948: Kathryn left the mall and drove toward the lake at an average speed of 52km/h. Jenny left three hours later and drove in the opposite direction with an average speed of 60km/h. How long does Jenny need to drive before they are 380km apart? Answer by ikleyn(52817) (Show Source):
Let t = How long does Jenny need to drive before they are 380km apart.
Then the time for Kathryn = (t + 3) hours.
Jenny's distance is 60*t kilometers.
Kathryn's distance is 52*(t+3) kilometers.
They move in opposite directions, so the distance between them is the sum of particular distances.
60t + 52*(t+3) = 380 kilometers.
Simplify and solve for t.
