You are eating lunch at your favorite cafe and your friend calls and says he wants to meet you. He is calling from a city 145 miles away and wants to...

You are eating lunch at your favorite cafe and your friend calls and says he wants to meet you. He is calling from a city 145 miles away and wants to meet you somewhere between the two locations. He says he will start driving right away, but you need 30.0 minutes to finish your lunch before you can begin driving. If your friend plans to drive at 70.0 mph and you plan to drive at 40.0 mph, how long will your friend be driving before he meets you? (Ignore acceleration and assume the highway forms a straight line).

a: 45 mins

b: 60 mins

c: 90 mins

d: 120 mins