Party A and Party B run on a 400 meter circular track. Party B runs 120 meters per minute on average. The speed of Party A is 1.5 times that of Party B, and Party A is 100 meters in front of Party B, How many minutes can a catch up with B? Solve the equation

Party A and Party B run on a 400 meter circular track. Party B runs 120 meters per minute on average. The speed of Party A is 1.5 times that of Party B, and Party A is 100 meters in front of Party B, How many minutes can a catch up with B? Solve the equation

Let a catch up with B in X minutes
120*1.5X-120*X=400-100
60X=300
X=5
A can catch up with B in five minutes