Question 1153414
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<pre>

Since Mr.Reed started 4.5 hours before Mrs.Reed, he has head start of 4.5*40 = 180 miles.


Due to the difference in their rates (90-40) = 50 miles per hour,

this distance between them decreases 50 miles each hour.



Hence, Mrs.Read will catch up Mt.Reed in  {{{180/50}}} = {{{3}}}{{{3/5}}} hours = 3 hours and 36 minutes.    <U>ANSWER</U>
</pre>

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