Alice Leaves Her House, Driving East At 45 Miles Per Hour (mph). Thirty Minutes Later, Her Husband Dave Notices She Forgot Her Cell Phone And Sets Off After Her. How Fast Must Dave Travel In Order To Catch Up With Alice 3 Hours After He Leaves?

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Oddman Profile
Oddman answered
Alice has a (45 mi/hr)*(1/2 hr) = 22 1/2 mi head start. To make up that distance in 3 hours, Dave must travel (22 1/2 mi)/(3 hr) = 7 1/2 mi/hr faster than she is.
Dave must travel 52 1/2 miles per hour to catch Alice in 3 hours.

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