Question 147168
picturing a circular track makes things easier


the slow car goes 360º in 120 sec or 3° per sec


the fast car goes 360° in 90 sec or 4° per sec


every second the cars are traveling, the fast car gains 1°
__ when the fast car has gained 360° (in 360 sec) the cars will pass again


so the cars pass every 360 sec or 6 min