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Alex and Desiree leave Michelle's house at the same time and in the same direction. Alex drove at a constant speed of 60 miles per hour, and Desiree drove at a constant speed of 40 miles per hour.

After one hour, Desiree increases her speed to catch up to Alex.

If Alex maintains his current speed, at which constant speed should Desiree drive to catch up to Alex in two hours, in miles per hour?

A

$75$

B

$70$

C

$65$

D

$72$

E

$80$

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