driver a is going west at 60 mph driver b leaves 3 hours later at a rate of 72 mph how long until driver b catches up to driver A

Question

driver a is going west at 60 mph driver b leaves 3 hours later at a rate of 72 mph how long until driver b catches up to  driver A

Steve · Answer

in 3 hours, A is 180 miles ahead. B is going 12 mi/hr faster, so how long to make up the 180 miles?

Forrest · Answer

60t=72(t-3) 60t=72t-216 -12t=-216 t=18 t-3=15 The answer is 15hrs