Car A is going 72km per Hour and Car B is going 90km per hour but started 140m behind Car A. How long will it take for Car B to reach Car A

going into new york using the george washington bridge, consumers must pay a toll (there is not toll to return to New jersey). they can pay $6 cash or they can pay $5 (during peak hour) using the E Z pass system. The E Z pass system is a prepaid plan that also requires a one-time $12 account activation fee. How many trips to new york would a person need to make (during peak hours) so that the total amount spent with the E Z pass is equal to the amount spent for tolls without the E Z pass?