Question 343639
Rebecca catches Larry when they have both traveled the same distance


distance equals rate multiplied by time


Rebecca's rate is 25 mph and her time is one hr less than Larry's


Larry's rate is 20 mph


the T in the equations represents Larry's time


depending on your viewpoint, you might say that Rebecca's time to catch Larry  doesn't start until Rebecca starts
___ so the answer is either 4 hr or 5 hr


hope this helps