SOLUTION: Anna leaves the house for school walking at the rate of 4kph. Two hours later, Elsa follows Anna at 4.5kph. How long will it take Elsa to over take Anna?

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Question 1169509: Anna leaves the house for school walking at the rate of 4kph. Two hours later, Elsa follows Anna at 4.5kph. How long will it take Elsa to over take Anna?
Answer by ikleyn(52809) About Me  (Show Source):
You can put this solution on YOUR website!
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At the moment Elsa starts,  Anna is  8 km ahead.     ( 8 km = 4 kph * 2 hours )


Beginning from this moment,  the distance between them decreases at the rate of
        0.5 kph = 4.5 kph - 4 kph.


Hence,  Anna will catch up  Elsa in    8%2F0.5 = 16 hours.         ANSWER

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Solved.


For simple Travel & Distance problems,  see introductory lessons
    - Travel and Distance problems
    - Travel and Distance problems for two bodies moving in opposite directions
    - Travel and Distance problems for two bodies moving in the same direction (catching up)
in this site.

They are written specially for you.

You will find the solutions of many similar problems there.

Read them and learn once and for all from these lessons on how to solve simple Travel and Distance problems.

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